diff --git a/findings/objects/ship-design-catalogue.md b/findings/objects/ship-design-catalogue.md
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+# The ship-design catalogue: how designs persist, hull size, and the `0x400` flag
+
+Lane D2, 2026-09-08. Static reading against the exe, checked against all 11 saves.
+
+Blocker #4 on lane Y's path to a byte-matching turn. Three lanes had brushed against the first
+question and each left it open; this closes it, and the answer corrects a published finding.
+
+---
+
+## 1. How ship designs persist — the serializer three lanes could not find
+
+**`Game::ShipDesign::Write` exists, is `0x008325e0`, and makes four stream calls.** The published
+finding — "`Game::ShipDesign::Write` (`0x008747a0`) makes no stream call at all" — is **wrong in its
+address**. `0x008747a0` is not this class's writer and is not a serializer of any kind: lane V2's
+exact vtable inversion puts it in **no vftable at all** (`vtable_map.py who 0x008747a0` →
+`is in no vftable`), and its body pops a parser stack. The serializer sweep attributed it to
+`ShipDesign` by a slot mapping that did not hold for this class.
+
+The class is not the shape the earlier note assumed either. RTTI `0x00a894a8`:
+
+```
+Game::ShipDesign : Game::ShipDesignDef, Mars::IStreamable, Mars::RefCounted, Mars::NetworkObject
+```
+
+`ShipDesignDef` is the **base**, and it is *not* an `IStreamable` — it declares its own three
+virtuals (`Read`, `Write`, dtor, vftable `0x009fef64`) in a different order from `IStreamable`'s.
+`ShipDesign` overrides all three; the `IStreamable` sub-object at `+0x9c` (vftable `0x00a32710`)
+holds three adjustor thunks back to the primary vftable `0x00a32720`. That thunk layer is why a
+slot-indexed sweep mis-keyed the class, and it is a **general warning for the serializer tool**: a
+class that inherits an interface *second* reaches its own writer through a thunk, and the thunk is
+what a slot walk finds.
+
+So a design persists as **two serializers, a base and a derived one**, exactly the `*Impl` shape
+lane G generalised — except the concrete class is a *derived class*, not a separate `Impl` class.
+Lane V2's caution was right: check the shape, do not assume it.
+
+### The full `Des` record, both writers, in disk order
+
+| # | tag | primitive | member | writer |
+|---|---|---|---|---|
+| 1 | `FAIDes` | **bool** | `+0x4` | `ShipDesignDef::Write` `0x00827390` |
+| 2 | `DHide` | **bool** | `+0x5` | " |
+| 3 | `DWep` | **bool** | `+0x6` | " |
+| 4 | `DName` | string | `+0x8` (`Mars::string`, `0x1c`) | " |
+| 5 | `DSec` | frame | `+0x4c` — **command** | " (via `StreamableHelper<ShipDesignDef::Section>`) |
+| 6 | `DSec` | frame | `+0x24` — **mission** | " |
+| 7 | `DSec` | frame | `+0x74` — **engine** | " |
+| 8 | `Dtc` | int | `+0x134` | `ShipDesign::Write` `0x008325e0` |
+| 9 | `Dwgv` | **bool** | `+0x16c` | " |
+| 10 | `Dwg` | frame, **only when `Dwgv`** | `+0x170`, `StreamableHelper<Game::WeaponGroups>` | " |
+
+`ShipDesign::Read` `0x008324f0` mirrors it, with one extra: it reads an int `DRefCnt` into a **null
+destination** — read and discarded — that the writer never emits. A network stream writes it; the
+save stream does not, and the tag-addressed reader tolerates the absence.
+
+### Three corrections this forces
+
+**(a) Three sections, not five.** `SHIP_DESIGN_RULES.md` §1 said "five section slots, three used;
+slots 3-4 are absent in every design (reserved)". There are **three**, and there is no reserved
+slot. Two independent enumerations (rule 5):
+
+* the writer emits exactly three `DSec` frames — a straight-line body, no loop;
+* the constructor `0x00874c70` runs `eh_vector_constructor_iterator(this+0x24, stride 0x28,
+  count 3)`, and `0x24 + 3*0x28 = 0x9c`, which is exactly where `ShipDesign`'s own `IStreamable`
+  vptr sits. `sizeof(Game::ShipDesignDef) == 0x9c`.
+
+The "two extra slots" were **`Dtc` and `Dwgv`**, swept into the section list by the reference Python
+reader's trailing `Rest("sections")` and then decoded by `stock_designs.py` as two empty sections.
+This is rule 8 in its exact form: the reader and its consumer agreed with each other and were both
+wrong, and nothing downstream could see it because an empty slot is a no-op for every rule. Fixed
+openly (§6).
+
+**(b) `DWep` and `Dwgv` are bools, not ints.** Both writers call the bool primitive. With their
+four-character tags a bool item and an int item are the same size on the wire and the values 0 and 1
+are the same bytes, so **no save can distinguish them** — the same class of defect as lane G's
+`ObservedTech.odet`, and byte-neutral for the same reason. Corrected in both readers; the engine's
+typed round trip stays byte-identical on all 11 saves.
+
+**(c) Offset order ≠ write order, again.** The section array is `[+0x24, +0x4c, +0x74]`; the wire is
+`[+0x4c, +0x24, +0x74]`. Reading the array in memory order gives **mission, command, engine**;
+reading the wire gives **command, mission, engine**. Both orders matter below — the wire order is
+what a save reader needs, the memory order is what decides hull size.
+
+---
+
+## 2. Hull size and the `0x400` flag
+
+Both live on `ShipDesign`, **neither is on the wire**, and both are recomputed from the data files
+by `ShipDesign::UpdateDerivedStats` `0x0087e7c0` whenever a design changes or is loaded.
+
+### `0x400` = `defence_platform`
+
+`ShipSectionDef` carries a **64-bit role-flag word** at `+0x298`/`+0x29c`. The `.shipsection` parser
+`0x005744e0` sets it one bit at a time: each boolean role key is a call to
+`SetRoleFlagBit(&flags, loMask, hiMask, value)` `0x0056e780`. At `0x005749b7`, immediately after the
+`strcmp` against the literal `defence_platform` at `0x009fea10`:
+
+```
+push ecx                 ; the parsed value
+push 0x0                 ; hi mask
+lea  edx,[esi+0x298]
+push 0x400               ; lo mask
+push edx
+call 0x0056e780
+```
+
+**`0x400` is `defence_platform`.** The rest of the word, from the same scan: `refueling_capacity`
+`0x2`, `repair_capacity` `0x4`, `refinery` `0x8`, `mining_capacity` `0x10`, `scanrange` /
+`rebelai_scanrange` `0x20`, `gateship` `0x40`, `ewar` `0x800`, `ramscoop` `0x1000`, `aicontrol`
+`0x2000`, `command_quota` `0x10000`, `node_bore` `0x20000`, `prisoner_capacity` `0x40000`,
+`freighter` `0x80000`, `gravboat_bonus` `0x200000`, `construction_capacity` `0x400000`, `science`
+`0x1000000`, `tradingpost` `0x2000000`, `freighterQ` `0x8000000`, `police` `0x10000000`, `spy`
+`0x40000000`, `spytender` `0x80000000`; high dword `colony_trap` `0x1`, `mining_trap` `0x2`,
+`monitor` `0x4`, `propaganda` `0x10`.
+
+The design's word is the **OR** across its resolved sections
+(`AggregateSectionStats` `0x00826af0`, `out[4] |= GetRoleFlags(section)`), so one flagged section
+flags the whole design. In the shipped data the 49 sections carrying `defence_platform` are exactly
+the `{DE,CR,DN}DefencePlatform`, `{CR,DN}TorpedoPlatform`, `{CR,DN}DronePlatform`,
+`CRDeepScanPlatform` families and `_VNeumannSatellite` — all standalone mission sections — so no
+shipped design mixes a flagged section with unflagged ones. That the rule is an OR is therefore
+**inferred from the instruction and untestable on the corpus** (rule 6); it is unit-tested in the
+engine on a synthetic design instead.
+
+**This is not lane B5's `0x400`.** A *fleet* gets flag `0x400` when the retreat pipeline creates it,
+and that flag reaches the wire as `FtFlg` — `turn1-state.sav`'s first fleet has `FtFlg 1024`. It is
+a different word on a different object. The numeral is a coincidence of two bit layouts, and the
+brief was right to say "check rather than assume".
+
+### Hull size = `section_class`
+
+`ShipSectionDef+0x260` is the parsed `section_class`, and the parse is a three-name table:
+
+```
+ParseShipClassName 0x0056e1c0:  _stricmp against "Destroyer", "Cruiser", "Dreadnought"
+                                stores the index it stopped at -> 0, 1, 2
+```
+
+Case-insensitive, which the data needs — the shipped catalogs write both `cruiser` and `Cruiser`.
+The wrapper `0x0056e250` logs `"  [%s] unrecognized ship class"` and stores **0** on no match, and
+a section with no `section_class` key at all never reaches the parser and keeps the constructed 0.
+So **absent or unrecognised is a destroyer, not an error**. 16 shipped sections have no
+`section_class` (the `_Biomissile` / `_BoardingPod` families and three `_NPC` stems).
+
+The design's hull size is `AggregateSectionStats`'s `out[0x1d] = sectionDef->+0x260`, copied to
+`ShipDesign+0x12c`. That is an **assignment inside the per-section loop, not a max and not an OR**,
+so the *last resolved section in memory slot order* wins — i.e. engine, else command, else mission.
+Rule A6 makes every shipped design class-homogeneous, so first-wins and last-wins agree on **all 503
+design records in the 11 saves** (measured, §4); the assignment order is implemented anyway because
+it is what the original does, and it is unit-tested on a hand-built mixed-class design.
+
+### One corroboration the census does not need
+
+The same `0x400` bit picks the design's **default hull health** when no section overrides it at
+`+0x2ac` (`0x00826af0`, `out[2]`):
+
+| hull size | without `0x400` | with `0x400` |
+|---|---|---|
+| 0 destroyer | 500 | 100 |
+| 1 cruiser | 3000 | 500 |
+| 2 dreadnought | 15000 | 1000 |
+
+A defence platform is a fifth to a fifteenth of the ship's hull. That is an independent reading of
+the same two words and it agrees: `0x400` separates *platforms* from *ships*, and `+0x12c` is the
+three-step hull-size ladder.
+
+---
+
+## 3. The census — what the two words feed
+
+`ShipCensusByHullClass` `0x00818a50` takes a player and an `int[8]`:
+
+```
+for each fleet in server.fleets where fleet->owner(+0x58) == player:
+    for each ship in fleet->ships(+0xa4..+0xa8):
+        design = ship->+0x14
+        if (design->+0xb8 & 0x400) == 0:  ++out[0];  ++out[2 + design->+0x12c]
+        else:                             ++out[1];  ++out[5 + design->+0x12c]
+```
+
+`out[0]`/`out[1]` are the two grand totals, which the caller computes and **discards**. The six
+breakdowns land at `turnRecord+0x2a..+0x34` and reach the wire as the three `cls` groups' **`shpt`**
+(ships) and **`satt`** (satellites — the game's own word for a defence platform).
+
+Note what the loop does *not* do: it never looks at the ship's own `PlrID`, only at the fleet's
+owner, and it never looks at the ship's health or state. Every ship in an owned fleet counts.
+
+---
+
+## 4. Measurement: 480 census leaves, 0 mismatched
+
+Rebuilt from the save's own state plus the section catalog, compared against the record the game
+archived for that save's own frame (the record is rebuilt at end of turn *and* on load, so it never
+has to survive a round trip).
+
+| saves | designs classified | leaves compared | **mismatched** |
+|---|---|---|---|
+| 11 | 503 | **480** | **0** |
+
+Computed twice, independently: once in Python off `save_reader.py` + `design_rules.py`, once in C++
+off the engine's own `shapes` reader and `game::data::Catalog`. The two disagree about how many
+sections a design has (the Python reader's five vs the engine's three, §1a) and still produce the
+same 480 numbers — so they are not the same check wearing two hats.
+
+**Coverage, reported as loudly as the result (rule 15).** Only **32 of the 480 leaves are nonzero in
+the archive**. A zero leaf agrees for free.
+
+| leaf | nonzero of 80 |
+|---|---|
+| cls 0 `shpt` — destroyer ships | **18** |
+| cls 0 `satt` — destroyer platforms | **3** |
+| cls 1 `shpt` — cruiser ships | 0 |
+| cls 1 `satt` — cruiser platforms | 0 |
+| cls 2 `shpt` — dreadnought ships | **11** |
+| cls 2 `satt` — dreadnought platforms | 0 |
+
+**Three of the six census leaves are unexercised, not verified.** No save in the corpus contains a
+cruiser of any kind or a dreadnought-class platform, so the cruiser column and the dreadnought
+platform cell are hypotheses (rule 6). They are cheap to exercise — a save taken after
+`IND_CruisCon` is researched and one cruiser is built would close the whole cruiser column, and
+`zuul-turn23-fleet23.sav`'s 27-destroyer fleet shows the destroyer path is genuinely loaded.
+
+Other honest residuals from the same run:
+
+* 0 ships whose design id is missing from the save's design tables;
+* 0 designs none of whose sections resolve against the catalog;
+* 0 designs where first-resolved and last-resolved section disagree on hull size (rule A6 predicts
+  0, and this is the measurement that says so rather than the assumption).
+
+---
+
+## 5. What this closes, and what it does not
+
+Against lane Y's baseline — turn1→turn2 **209→204**, turn2→turn3 **108→103**, 5 closed / 0
+regressed, with the 204 broken down `/Sim/players` 82, `/Sim/systems` 80, `/Sim/turnstats` 24,
+`/Sim/SvSctOb` 8, plus 10 singletons:
+
+**closed: 0. regressed: 0.** Reported separately, and both are zero *in the standalone's divergence
+list*, because this lane wrote no phase.
+
+That is the honest number and it needs the reason spelled out. The census leaves live under
+`/Sim/turnstats`, and the turn record is built by `src/app/turn_record.cpp`, which **lane A2 holds**
+this cycle (the alliance mask `almem` is a field of the same record). Committing a census field into
+that file now is exactly the cross-lane collision the fragment discipline exists to prevent. So this
+lane did what lane S2's convention prescribes for a phase whose formula is held but whose write-out
+is not this lane's: **evaluate and report, do not write**.
+
+What is now unblocked, quantified:
+
+* **6 of the 24 `/Sim/turnstats` leaves per pair** — `shpt` ×3 and `satt` ×3 — have a formula that
+  reproduces the archived value on 480 of 480 observations. Wiring them is one call to
+  `game::design::ShipCensus` inside `BuildTurnRecord`, and the earlier `--commit-blocked` run's
+  "three leaves of the ship census" among its 17 regressions were exactly these, wrong because the
+  record committed zeros. They should now commit clean.
+* **The ship records** (`Player.ShipRecs`) and **tail phase T24** both need the same two words per
+  design; they are now available as `DesignStats::hull_size` / `DesignStats::defence_platform` and
+  as the standalone `classify_design()`.
+* The turn record's other four unmodelled fields are **not** touched: `almem` is lane A2's,
+  `tdinc` waits on per-system money output, `bat` is a tail stub, and `sacq`/`slost` have count 0 in
+  every save (rule 6).
+
+Nothing here was compared against the live game. `verified` in the phase catalog means "compared
+against the running game", and this is not that — it is a comparison against bytes the original
+wrote, which is the strongest instrument a lane holding no VM has.
+
+---
+
+## 6. Fixes to the oracles, made openly (rule 12)
+
+Two readers carried the same wrong record shape; both are fixed, with a test per defect and
+byte-neutrality shown.
+
+**`verify/save-reader/save_reader.py`** — the `Des` shape ended in `Rest("sections")`. Now: three
+`DSec` frames as a `Repeat`, then named `Dtc` (int) and `Dwgv` (bool), then the conditional `Dwg`;
+`DWep` retyped int → bool. All 11 saves still read strict-clean; the reader's own suite is **49/49**
+(was 48; three existing tests asserted the old shape and were corrected, one test added that pins
+"exactly three `DSec`" against the real saves).
+
+**`verify/design-rules/stock_designs.json`** regenerated from the same three saves. The diff is
+*only* `raw_slots` 5 → 3 and `dWep` `0/1` → `false/true`; every other field of all 127 designs is
+byte-for-byte the same, and `test_design_rules.py` is **32/32** with the same ground truth
+(127/127 structural, 197/197 `DOpts`, 121/127 gating with the six Tarkas hidden-rider warns).
+
+**`sots-engine` `src/mars/stream/shapes.h`** — `Design::dWep` and `Design::dwgv` retyped to bool,
+the conditional `Dwg` node added, and the comment that said the derived writer made no stream call
+replaced with the recovered layout. The typed round trip is still **byte-identical on all 11 saves**
+at 100% named coverage.
+
+The engine's `stock_designs.cpp` fixture loader now accepts 3–5 `raw_slots` so an old fixture still
+loads. `kSlotCount` is deliberately **left at 5**: the extra two array entries are inert and
+touching the enum reaches `rules.cpp` and another lane's tests for no behavioural gain. The comment
+in `design.h` is corrected instead — the record is three sections, and the fifth-slot slack is this
+engine's own, not the game's.
+
+---
+
+## 7. Open, and what would close it
+
+1. **The cruiser column and the dreadnought-platform cell** are unexercised (§4). One save with a
+   cruiser in it and one with a DN defence platform close three leaves. Cheapest of everything on
+   this page.
+2. **`Dtc`** (`+0x134`) is on the wire and is stamped by at least one caller immediately before the
+   recompute; its meaning is not read here. It is 1 on the stock designs.
+3. **`Dwgv`/`Dwg`** — weapon groups — are false in every save. The conditional branch is implemented
+   from the instruction and is unexercised.
+4. **The other 24 role-flag bits** are decoded (§2) but only `0x400` is consumed by anything this
+   lane read. `0x80000` (`freighter`) and `0x8000000` (`freighterQ`) drive a *second* classifier
+   `0x0081a430`/`0x0082c7c0` over the same two words — worth reading if a freighter count turns up
+   missing elsewhere.
+5. **The remaining ~24 fields of the aggregator's output struct** (`+0x18`..`+0x64` →
+   `ShipDesign+0xc0`..`+0x118`) are the rest of the derived-stat block — mass, cost, capacities,
+   speeds. `SHIP_DESIGN_RULES.md` §6 derives most of them from the data with the formulas marked as
+   assumptions; `0x00826af0` is where every one of those assumptions can be settled, field by field,
+   and it is now a named function.
+
+---
+
+## Addresses
+
+`ghidra/addresses.d/lane-d2.json` (19 entries, no collision with any existing fragment).
+Key ones: `ShipDesignDef::Write` `0x00827390`, `ShipDesign::Write` `0x008325e0`,
+`ShipDesign::UpdateDerivedStats` `0x0087e7c0`, `AggregateSectionStats` `0x00826af0`,
+`ShipSectionDef::GetRoleFlags` `0x0056ee80`, `ParseShipClassName` `0x0056e1c0`,
+`SetRoleFlagBit` `0x0056e780`, `ShipCensusByHullClass` `0x00818a50`;
+offsets `ShipDesign+0xb8` (role flags), `+0x12c` (hull size), `ShipSectionDef+0x260`
+(`section_class`), `+0x298` (role flags).
diff --git a/ghidra/addresses.d/lane-d2.json b/ghidra/addresses.d/lane-d2.json
new file mode 100644
index 0000000..6250a14
--- /dev/null
+++ b/ghidra/addresses.d/lane-d2.json
@@ -0,0 +1,156 @@
+{
+ "entries": [
+  {
+   "name": "Game_ShipDesignDef_Write",
+   "addr": "0x00827390",
+   "convention": "thiscall",
+   "prototype": "void (Game_ShipDesignDef* this, Mars::Stream* s)  // THE DESIGN SERIALIZER LANE D SAID DID NOT EXIST. Slot 1 of the ShipDesignDef vftable 0x009fef64. Writes, in DISK order: WriteBool 'FAIDes' this+0x4, WriteBool 'DHide' this+0x5, WriteBool 'DWep' this+0x6 (a BOOL, not an int -- the campaign schema had it as int; byte-neutral because a 4-char tag makes both items 12 bytes), WriteString 'DName' this+0x8, then THREE 'DSec' frames through StreamableHelper<ShipDesignDef::Section> at this+0x4c, this+0x24, this+0x74 in that order. THREE sections, not five: the ctor 0x00874c70 runs eh_vector_constructor_iterator(this+0x24, stride 0x28, count 3). MEMORY ORDER != WRITE ORDER: the array is [+0x24, +0x4c, +0x74] and the wire is [+0x4c (command), +0x24 (mission), +0x74 (engine)]",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ShipDesignDef_Read",
+   "addr": "0x00827240",
+   "convention": "thiscall",
+   "prototype": "void (Game_ShipDesignDef* this, Mars::Stream* s)  // slot 0 of vftable 0x009fef64. Mirrors Write field for field, same tags, same three DSec frames in the same order",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ShipDesign_Write",
+   "addr": "0x008325e0",
+   "convention": "thiscall",
+   "prototype": "void (Game_ShipDesign* this, Mars::Stream* s)  // CORRECTS 'Game::ShipDesign::Write (0x008747a0) makes no stream call at all': 0x008747a0 is in NO vftable and is not this class's writer. Game::ShipDesign derives from Game::ShipDesignDef (RTTI 0x00a894a8: ShipDesign, ShipDesignDef, IStreamable, RefCounted, NetworkObject; IStreamable sub-object at +0x9c, NetworkObject at +0xa0). Primary vftable 0x00a32720 slot 1; the +0x9c IStreamable vftable 0x00a32710 reaches it through an adjustor thunk at 0x00874de0. Body: direct call to ShipDesignDef::Write 0x00827390 (the base part), then WriteInt 'Dtc' this+0x134, WriteBool 'Dwgv' this+0x16c, and ONLY IF that flag is set a 'Dwg' frame through StreamableHelper<Game::WeaponGroups> at this+0x170. Dwgv is false in all 11 saves, so the Dwg branch is unexercised (rule 6)",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ShipDesign_Read",
+   "addr": "0x008324f0",
+   "convention": "thiscall",
+   "prototype": "void (Game_ShipDesign* this, Mars::Stream* s)  // primary vftable 0x00a32720 slot 0. Calls ShipDesignDef::Read, then ReadInt 'DRefCnt' into a NULL destination (read and discarded; the WRITER never emits it, so it is a network-stream field the tag-addressed reader tolerates), then 'Dtc', 'Dwgv' and the conditional 'Dwg'",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ShipDesign_ctor",
+   "addr": "0x00874c70",
+   "convention": "thiscall",
+   "prototype": "Game_ShipDesign* (Game_ShipDesign* this)  // installs ShipDesignDef::vftable at +0, then IStreamable/NetworkObject at +0x9c/+0xa0 and the three ShipDesign vftables. Constructs the DName string at +0x8 and eh_vector_constructor_iterator(this+0x24, 0x28, 3) -- the three section records. Enumerates sizeof(Game_ShipDesignDef) == 0x9c",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ShipDesign_UpdateDerivedStats",
+   "addr": "0x0087e7c0",
+   "convention": "fastcall",
+   "prototype": "void (Game_ShipDesign* this)  // THE RECOMPUTE THAT PRODUCES BOTH CENSUS WORDS. 16 call sites; one of them stamps this+0x134 (Dtc) and calls straight in. (1) resolves each of the three section records this+0x24/+0x4c/+0x74 to a ShipSectionDef* through the catalog lookup 0x0056edd0 and caches them at this+0xac/+0xb0/+0xb4, IN MEMORY SLOT ORDER; (2) builds a 3-element context array (stride 0x124) and hands it to the aggregator 0x00826af0 together with this+0x130; (3) copies the aggregator's ~0x7c-byte output struct into the design: struct+0x10 -> this+0xb8 (role flags, low dword), struct+0x14 -> this+0xbc (high dword), struct+0x18..+0x64 -> this+0xc0..+0x118, struct+0x74 -> this+0x12c (HULL SIZE), struct+0x78 -> this+0x1a4, struct+0x00..+0x0c -> this+0x138..+0x144. Neither this+0xb8 nor this+0x12c is on the wire: they are rebuilt from the data files whenever a design changes or is loaded",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ShipDesign_AggregateSectionStats",
+   "addr": "0x00826af0",
+   "convention": "cdecl",
+   "prototype": "void (DesignStatBlock* out, SectionContext ctx[3], void* techCtx, char flag)  // walks the three section contexts (stride 0x124, ctx[i]+0 = the ShipSectionDef*, null = empty slot). out[4]/out[5] (the 64-bit role-flag word) |= ShipSectionDef::GetRoleFlags 0x0056ee80 per section -- an OR, so ONE flagged section flags the whole design. out[0x1d] (hull size) = sectionDef+0x260 -- an ASSIGNMENT, so the LAST resolved section in memory slot order wins; every shipped design is section_class-homogeneous so first-wins and last-wins agree on all 503 design records in the corpus. Also: out[6] x5 when any section carries tech 0x2756; out[4] &= ~0x80 for tech 0x2757; out[4] |= 0x100000 when EVERY section carries tech 0x2742. Default hull health (out[2]) is chosen by the SAME 0x400 bit when no section overrides it at +0x2ac: without 0x400 hull 0/1/2 -> 500/3000/15000, with 0x400 -> 100/500/1000",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ShipSectionDef_GetRoleFlags",
+   "addr": "0x0056ee80",
+   "convention": "thiscall",
+   "prototype": "unsigned __int64 (Game_ShipSectionDef* this, void* ctx)  // returns CONCAT(this+0x29c, this+0x298) -- the section's 64-bit role-flag word straight out of the parsed .shipsection -- with bit 0x20 of the low dword OR-ed in when ctx is non-null, ctx+0xfc is set and this+0x304 > 0. That conditional bit is the only part of the word that is not pure file data",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ShipSectionCatalog_FindByID",
+   "addr": "0x0056edd0",
+   "convention": "thiscall",
+   "prototype": "Game_ShipSectionDef* (SectionCatalog* this, Game_ShipSectionID* id)  // linear scan of the vector at this+0x8/+0xc matching def+0x4 == id->species and def+0x8 == id->sectionId. Returns null for the (0,0) empty slot without scanning",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ParseShipClassName",
+   "addr": "0x0056e1c0",
+   "convention": "cdecl",
+   "prototype": "bool (int* out, const char* name)  // THE HULL-SIZE DEFINITION. _stricmp against \"Destroyer\", \"Cruiser\", \"Dreadnought\" in that order and stores the index it stopped at: 0, 1, 2. Returns false without writing on no match",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ShipSectionDef_ParseSectionClass",
+   "addr": "0x0056e250",
+   "convention": "cdecl",
+   "prototype": "bool (int* out, const char* name)  // wraps 0x0056e1c0 for the `section_class` key; on failure logs \"  [%s] unrecognized ship class\" and stores 0, so an unknown OR ABSENT section_class is a destroyer, not an error",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_SetRoleFlagBit",
+   "addr": "0x0056e780",
+   "convention": "cdecl",
+   "prototype": "void (unsigned __int64* flags, unsigned int loMask, unsigned int hiMask, bool value)  // the .shipsection parser's flag setter. Every boolean role key in the section parser 0x005744e0 is one call to this with its own mask pair; `defence_platform` is (lo 0x400, hi 0) at 0x005749b7, `monitor` is (lo 0, hi 0x4), `refinery` 0x8, `mining_capacity` 0x10, `scanrange`/`rebelai_scanrange` 0x20, `gateship` 0x40, `ewar` 0x800, `ramscoop` 0x1000, `aicontrol` 0x2000, `command_quota` 0x10000, `node_bore` 0x20000, `prisoner_capacity` 0x40000, `freighter` 0x80000, `gravboat_bonus` 0x200000, `construction_capacity` 0x400000, `science` 0x1000000, `tradingpost` 0x2000000, `freighterQ` 0x8000000, `police` 0x10000000, `spy` 0x40000000, `spytender` 0x80000000, `refueling_capacity` 0x2, `repair_capacity` 0x4; high dword: `colony_trap` 0x1, `mining_trap` 0x2, `monitor` 0x4, `propaganda` 0x10",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ServerPlayer_ShipCensusByHullClass",
+   "addr": "0x00818a50",
+   "convention": "cdecl",
+   "prototype": "void (ServerPlayer* p, int out[8])  // THE CENSUS. Zeroes out[0..7], then walks the server's fleet vector (p+0x8 -> S, S+0x60/+0x64), keeps fleets whose owner (fleet+0x58) is p, and for every ship in fleet+0xa4/+0xa8 takes design = ship+0x14. If (design+0xb8 & 0x400) == 0: ++out[0] and ++out[2 + design->hullSize(+0x12c)]; else ++out[1] and ++out[5 + hullSize]. So out[0]/out[1] are the two grand totals (computed and DISCARDED by the caller), out[2..4] are ships by hull size 0/1/2 and out[5..7] are defence platforms by hull size. The six land at turnRecord+0x2a..+0x34 and reach the wire as the three `cls` groups' `shpt` and `satt`",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "Game_ShipDesign_IsMobileWarshipClass",
+   "addr": "0x0081a430",
+   "convention": "cdecl",
+   "prototype": "int (Game_ShipDesign* design)  // a SECOND classifier over the same two words, kept because it shows the flag word is a role set and not a single bit: returns -1 when the design lacks flag 0x80000 (`freighter`), else for hull size 1 returns 0 when 0x8000000 (`freighterQ`) is set and 1 otherwise, and 2 for any other hull size. 0x0082c7c0 is the matching counter over a fleet list. NOT the census -- neither reads 0x400",
+   "status": "unverified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "ShipDesign_off_RoleFlagsLow",
+   "offset": "0xb8",
+   "convention": "offset",
+   "prototype": "unsigned int  // low dword of the design's 64-bit role-flag word, the OR of its sections'. Bit 0x400 = `defence_platform`. High dword at +0xbc. NOT on the wire; rebuilt by 0x0087e7c0",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "ShipDesign_off_HullSize",
+   "offset": "0x12c",
+   "convention": "offset",
+   "prototype": "int  // 0 destroyer / 1 cruiser / 2 dreadnought, from the last resolved section's `section_class`. NOT on the wire; rebuilt by 0x0087e7c0",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "ShipDesign_off_Dtc",
+   "offset": "0x134",
+   "convention": "offset",
+   "prototype": "int  // the wire field `Dtc`, written by ShipDesign::Write and stamped by at least one caller immediately before it calls the recompute 0x0087e7c0",
+   "status": "unverified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "ShipSectionDef_off_SectionClass",
+   "offset": "0x260",
+   "convention": "offset",
+   "prototype": "int  // parsed `section_class`: 0 destroyer / 1 cruiser / 2 dreadnought, 0 when absent or unrecognised",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  },
+  {
+   "name": "ShipSectionDef_off_RoleFlagsLow",
+   "offset": "0x298",
+   "convention": "offset",
+   "prototype": "unsigned int  // low dword of the section's 64-bit role-flag word (high dword at +0x29c), one bit per boolean role key in the .shipsection file",
+   "status": "verified",
+   "source": "findings/objects/ship-design-catalogue.md"
+  }
+ ]
+}
diff --git a/verify/design-rules/SHIP_DESIGN_RULES.md b/verify/design-rules/SHIP_DESIGN_RULES.md
index 9e0fdbb..3598e1f 100644
--- a/verify/design-rules/SHIP_DESIGN_RULES.md
+++ b/verify/design-rules/SHIP_DESIGN_RULES.md
@@ -29,15 +29,31 @@ From the save (`Player.designs[]` / `Player.legacyDesigns[]`, fully decoded in
 `stock_designs.py`):
 
 ```
-Des { faiDes bool, dHide bool, dWep int, dName string,
-      sections[5] : DSec { DSec { int species_idx, int section_id },
+Des { faiDes bool, dHide bool, dWep bool, dName string,
+      sections[3] : DSec { DSec { int species_idx, int section_id },
                            DGbnk2 { int n_banks, n x ( DW2 { bool bID, wid int | wfn string, int did } ) },
-                           DOpts  { int n, n x tech-name string } } }
+                           DOpts  { int n, n x tech-name string } },
+      dtc int, dwgv bool, [ Dwg {...} only when dwgv ] }
 ```
 
-* **Five section slots, three used**: slot 0 = command, 1 = mission, 2 = engine;
-  slots 3-4 are absent in every design (reserved).  An empty slot is
-  `(species 0, section 0)`; ids in `_shipsections.txt` start at 1.
+> **CORRECTION (lane D2, 2026-09-08).** This section used to read `sections[5]` and
+> "five section slots, three used; slots 3-4 are absent in every design
+> (reserved)".  **There are three sections and no reserved slots.**  The two
+> extra entries were `Dtc` and `Dwgv` — the derived writer's own tail — swept
+> into the section list by `save_reader.py`'s trailing `Rest("sections")` and
+> then decoded by `stock_designs.py` as two empty sections.  Both writers are
+> now recovered: `Game::ShipDesignDef::Write 0x00827390` emits the four scalars
+> and exactly three `DSec` frames, `Game::ShipDesign::Write 0x008325e0` appends
+> `Dtc`, `Dwgv` and the conditional `Dwg`.  The constructor confirms the count
+> independently (`eh_vector_constructor_iterator(this+0x24, stride 0x28,
+> count 3)`, and `0x24 + 3*0x28 = 0x9c = sizeof(ShipDesignDef)`).  `dWep` is a
+> **bool** on the wire, not an int — byte-indistinguishable, writer-decidable.
+> See `findings/objects/ship-design-catalogue.md`.
+
+* **Three section slots**: disk order 0 = command, 1 = mission, 2 = engine.  An
+  empty slot is `(species 0, section 0)`; ids in `_shipsections.txt` start at 1.
+  (In memory the array is ordered mission, command, engine — offset order is not
+  write order here, and the memory order is what decides hull size.)
 * `species_idx` indexes the save's species table `Human, Hiver, Tarkas, Liir,
   _NPC, Zuul, Morrigi` (`SPECIES_INDEX`); `section_id` is the race's
   `_shipsections.txt` id.  Every design in the saves uses one species for all
@@ -260,6 +276,30 @@ Zuul sections) -- last value taken; engine behaviour unknown.
   4x gauss + `mis`), hidden `Default Assault Shuttle`.  The `Independent
   Colony` NPC has a Tarkas `Defence Platform` with `las_red` x4 + `mis`.
 
+## 7A. Hull size and the class flag (lane D2, code-settled)
+
+Two derived words the design caches, **neither on the wire**, both rebuilt from
+this catalog by `ShipDesign::UpdateDerivedStats 0x0087e7c0` whenever a design
+changes or is loaded.  They are what the turn record's per-hull-class ship
+census counts by.  Full derivation in
+`findings/objects/ship-design-catalogue.md`.
+
+| word | rule |
+|---|---|
+| **hull size** (`ShipDesign+0x12c`) | the `section_class` of the **last resolved section in memory slot order** (engine, else command, else mission), mapped `Destroyer 0 / Cruiser 1 / Dreadnought 2` case-insensitively.  Absent or unrecognised -> **0**, with a log line, not an error — settles the 16 shipped sections with no `section_class`.  Assignment, not max: A6 makes first-wins and last-wins agree on all 503 design records in the 11 saves |
+| **role flags** (`ShipDesign+0xb8`/`+0xbc`, 64-bit) | the **OR** of every resolved section's own flag word.  One bit per boolean role key; `defence_platform` is `0x400` of the low dword.  The OR is read from the instruction and is untestable on shipped data — no design mixes a flagged with an unflagged section |
+
+The same `0x400` bit also picks the design's default hull health when no section
+overrides it: without it `500 / 3000 / 15000` by hull size, with it
+`100 / 500 / 1000`.  So the flag separates *platforms* from *ships*, which is
+exactly how the census uses it (`shpt` vs `satt`).
+
+This also answers §8 question 1 in part: **A6 is not enforced by this path.**
+The aggregator assigns the class from whichever section it visits last and never
+compares the three, so a mixed-class design would be silently classified by its
+engine section rather than rejected here.  Whether the *designer UI* rejects it
+is still open.
+
 ## 8. Open questions for the Ghidra side
 
 1. **Class-equality (A6)** -- enforced in `ShipDesignDef` validation, or only
diff --git a/verify/design-rules/stock_designs.json b/verify/design-rules/stock_designs.json
index 23e93a0..442d985 100644
--- a/verify/design-rules/stock_designs.json
+++ b/verify/design-rules/stock_designs.json
@@ -93,7 +93,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -137,20 +137,6 @@
       "rider_design_ids": [
        0
       ]
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
      }
     ],
     "player_race": "Human"
@@ -212,7 +198,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -247,20 +233,6 @@
       "rider_design_ids": [
        0
       ]
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
      }
     ],
     "player_race": "Human"
@@ -322,7 +294,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -357,20 +329,6 @@
       "rider_design_ids": [
        0
       ]
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
      }
     ],
     "player_race": "Human"
@@ -434,7 +392,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -474,20 +432,6 @@
       "rider_design_ids": [
        0
       ]
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
      }
     ],
     "player_race": "Human"
@@ -538,7 +482,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -567,20 +511,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -631,7 +561,7 @@
     "list": "legacyDesigns",
     "faiDes": false,
     "dHide": true,
-    "dWep": 1,
+    "dWep": true,
     "raw_slots": [
      {
       "species": 0,
@@ -647,20 +577,6 @@
       "options": [],
       "bank_count": 0
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -767,7 +683,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 2,
@@ -811,20 +727,6 @@
        0,
        0
       ]
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
      }
     ],
     "player_race": "Tarkas"
@@ -887,7 +789,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 2,
@@ -924,20 +826,6 @@
        0,
        0
       ]
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
      }
     ],
     "player_race": "Tarkas"
@@ -1000,7 +888,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 2,
@@ -1037,20 +925,6 @@
        0,
        0
       ]
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
      }
     ],
     "player_race": "Tarkas"
@@ -1117,7 +991,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 2,
@@ -1163,20 +1037,6 @@
        0,
        0
       ]
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
      }
     ],
     "player_race": "Tarkas"
@@ -1227,7 +1087,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -1256,20 +1116,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -1322,7 +1168,7 @@
     "list": "legacyDesigns",
     "faiDes": false,
     "dHide": true,
-    "dWep": 1,
+    "dWep": true,
     "raw_slots": [
      {
       "species": 0,
@@ -1340,20 +1186,6 @@
       ],
       "bank_count": 0
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -1479,7 +1311,7 @@
     "list": "legacyDesigns",
     "faiDes": false,
     "dHide": true,
-    "dWep": 1,
+    "dWep": true,
     "raw_slots": [
      {
       "species": 0,
@@ -1495,20 +1327,6 @@
       "options": [],
       "bank_count": 0
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -1636,7 +1454,7 @@
     "list": "legacyDesigns",
     "faiDes": false,
     "dHide": true,
-    "dWep": 1,
+    "dWep": true,
     "raw_slots": [
      {
       "species": 0,
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@@ -34663,7 +33109,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -34709,20 +33155,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -35062,7 +33494,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -35108,20 +33540,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -35461,7 +33879,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -35507,20 +33925,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -35860,7 +34264,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -35906,20 +34310,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -36249,7 +34639,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -36275,20 +34665,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -36623,7 +34999,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 1,
+    "dWep": true,
     "raw_slots": [
      {
       "species": 0,
@@ -36657,20 +35033,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -37011,7 +35373,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -37056,20 +35418,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -37710,7 +36058,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 1,
+    "dWep": true,
     "raw_slots": [
      {
       "species": 0,
@@ -37744,20 +36092,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -38420,7 +36754,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -38497,20 +36831,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -38866,7 +37186,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 4,
@@ -38907,20 +37227,6 @@
        "IND_RefCoat"
       ],
       "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
      }
     ],
     "player_race": "_NPC"
@@ -39251,7 +37557,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -39288,20 +37594,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -39635,7 +37927,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -39674,20 +37966,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -40011,7 +38289,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -40029,20 +38307,6 @@
       ],
       "bank_count": 0
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -40377,7 +38641,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 1,
+    "dWep": true,
     "raw_slots": [
      {
       "species": 0,
@@ -40411,20 +38675,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -41043,7 +39293,7 @@
     "list": "designs",
     "faiDes": false,
     "dHide": false,
-    "dWep": 1,
+    "dWep": true,
     "raw_slots": [
      {
       "species": 0,
@@ -41077,20 +39327,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
@@ -41407,7 +39643,7 @@
     "list": "legacyDesigns",
     "faiDes": false,
     "dHide": false,
-    "dWep": 0,
+    "dWep": false,
     "raw_slots": [
      {
       "species": 0,
@@ -41436,20 +39672,6 @@
        0
       ]
      },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
-     {
-      "species": 0,
-      "section_id": 0,
-      "weapons": [],
-      "options": [],
-      "bank_count": 0
-     },
      {
       "species": 0,
       "section_id": 0,
diff --git a/verify/save-reader/SAVE_FORMAT.md b/verify/save-reader/SAVE_FORMAT.md
index 7971dad..0eed709 100644
--- a/verify/save-reader/SAVE_FORMAT.md
+++ b/verify/save-reader/SAVE_FORMAT.md
@@ -161,7 +161,20 @@ IsFxAv FxAv Tag Pwd(string) Team Settings{4×"." int}`.
 senp seno2 n×seot2`) `trn almem inc tdinc sav col bat tch`(int) `ncls` 3 × (`cls shpt shpl shpk satt
 satl satk`).
 `Des` (design header, under `NumDes`/`NumLeg` n × (`DesID`, `Des{}`)): `FAIDes`(bool) `DHide`(bool)
-`DWep`(int) `DName`(string), then the `DSec` section frames (kept generic).
+`DWep`(**bool**) `DName`(string), then **exactly three** `DSec` section frames — command, mission,
+engine in that disk order, kept generic — then `Dtc`(int) `Dwgv`(**bool**) and, only when `Dwgv` is
+set, a `Dwg` weapon-group frame (`Dwgv` is false in every save available).
+
+> **Confirmed against the binary (2026-09-08, lane D2).** A design is written by
+> **two** serializers: `Game::ShipDesignDef::Write` `0x00827390` (the four scalars and the three
+> `DSec` frames, in wire order `+0x4c +0x24 +0x74`) and its subclass `Game::ShipDesign::Write`
+> `0x008325e0` (`Dtc`, `Dwgv`, conditional `Dwg`). This **corrects two published claims**:
+> `Game::ShipDesign::Write` is not `0x008747a0` and does not "make no stream call" — that address is
+> in no vftable at all; and the record has **three** sections, not five. The reader's old
+> `Rest("sections")` swept `Dtc` and `Dwgv` into the section list, which is where the "slots 3-4 are
+> reserved and always empty" claim came from. `DWep` and `Dwgv` are `WriteBool`; with four-character
+> tags a bool item and an int item are the same size and 0/1 the same bytes, so the change is
+> byte-neutral and no save could have shown it. See `findings/objects/ship-design-catalogue.md`.
 Objective records (Player `odes`/`owep`/`otch`, each a framed VectorHelper of `"."` elements):
 `odes` = `otnF otnL odid opid`; `owep` = `otnF otnL odet owep`(string) `owith`; `otch` = `otnF otnL odet
 otch`(string) `owith`.
diff --git a/verify/save-reader/save_reader.py b/verify/save-reader/save_reader.py
index 7236ce6..a6259dc 100644
--- a/verify/save-reader/save_reader.py
+++ b/verify/save-reader/save_reader.py
@@ -520,9 +520,28 @@ CivilianRatios = Shape("civr", [A("smx", "float"), A("spe", SpeciesRatios), Rest
 # Design header: on-disk tags are FAIDes/DHide/DWep/DName (R1's camel-case names
 # were wrong).  The typed-dict keys keep R1's spelling because
 # verify/design-rules/stock_designs.py consumes them.
+#
+# TWO writers, a base and a derived one (lane D2): the base emits the four
+# scalars then EXACTLY THREE `DSec` frames -- command, mission, engine, in that
+# order -- and the derived one appends `Dtc`, the `Dwgv` flag and, only when
+# that flag is set, the `Dwg` weapon-group frame.
+#
+# `DWep` and `Dwgv` are BOOLs, not ints: both writers call the bool primitive.
+# With four-character tags a bool item and an int item are the same size on the
+# wire and the values 0/1 are the same bytes, so no save can tell them apart --
+# this is the same class of defect as `ObservedTech.odet`, and it is byte-neutral.
+#
+# CORRECTION (lane D2): this shape used to end in `Rest("sections")`, which swept
+# `Dtc` and `Dwgv` into the section list.  That is where the campaign's "five
+# section slots, of which slots 3 and 4 are reserved and always empty" claim came
+# from -- there are three sections and no reserved slots.
 Design = Shape("Des", [
     A("FAIDes", "bool", key="faiDes"), A("DHide", "bool", key="dHide"),
-    A("DWep", "int", key="dWep"), A("DName", "string", key="dName"), Rest("sections"),
+    A("DWep", "bool", key="dWep"), A("DName", "string", key="dName"),
+    Repeat(A("DSec", "any"), key="sections"),
+    A("Dtc", "int", key="dtc"), A("Dwgv", "bool", key="dwgv"),
+    If("dwgv", A("Dwg", "any", key="weaponGroups")),   # never set in any save available
+    Rest(),
 ])
 ConMods = Shape("ConMods", [
     A("ConMod", "float", key="ConMod0"), A("SavMod", "float", key="SavMod0"),
diff --git a/verify/save-reader/test_save_reader.py b/verify/save-reader/test_save_reader.py
index b1b91e9..e40d7e3 100644
--- a/verify/save-reader/test_save_reader.py
+++ b/verify/save-reader/test_save_reader.py
@@ -426,11 +426,16 @@ class TagNameCorrectionsTest(unittest.TestCase):
             names = self.field_names(shape)
             self.assertEqual(names[0], ("otnF", True))                # not R1's "ontF"
             self.assertTrue(all(auth for _, auth in names), names)
+        # Lane D2: the derived writer's Dtc/Dwgv are named fields, not part of the
+        # section run; the run itself is a Repeat and holds exactly the three DSec frames.
         self.assertEqual(self.field_names(sr.Design),
-                         [("FAIDes", True), ("DHide", True), ("DWep", True), ("DName", True)])
+                         [("FAIDes", True), ("DHide", True), ("DWep", True), ("DName", True),
+                          ("Dtc", True), ("Dwgv", True)])
         # typed-dict keys keep R1's spelling (verify/design-rules/stock_designs.py reads them)
         self.assertEqual([f.key for f in sr.Design.fields if isinstance(f, sr.Field)],
-                         ["faiDes", "dHide", "dWep", "dName"])
+                         ["faiDes", "dHide", "dWep", "dName", "dtc", "dwgv"])
+        rep = [f for f in sr.Design.fields if isinstance(f, sr.Repeat)]
+        self.assertEqual([(r.lead, r.key) for r in rep], [("DSec", "sections")])
         self.assertEqual(self.field_names(sr.NodeGrid), [("paths", True), ("nextid", True)])
         self.assertEqual(self.field_names(sr.BuildQueue), [("ords", True)])
         self.assertEqual(self.field_names(sr.FlightPlan)[0], ("wpts", True))
@@ -444,7 +449,8 @@ class TagNameCorrectionsTest(unittest.TestCase):
         self.assertEqual(sr.GLOBAL_KINDS["nextid"], "int")
         self.assertEqual((sr.GLOBAL_KINDS["FAIDes"], sr.GLOBAL_KINDS["DHide"],
                           sr.GLOBAL_KINDS["DWep"], sr.GLOBAL_KINDS["DName"]),
-                         ("bool", "bool", "int", "string"))
+                         ("bool", "bool", "bool", "string"))   # DWep is WriteBool, not WriteInt
+        self.assertEqual(sr.GLOBAL_KINDS["Dwgv"], "bool")      # likewise
         for name in ("ords", "wpts", "paths"):
             self.assertIsInstance(sr.GLOBAL_SHAPES[name], sr.CArr)
 
@@ -479,8 +485,9 @@ class TagNameCorrectionsTest(unittest.TestCase):
     def design(tags):
         w = sw.SaveWriter()
         w.begin("Des")
-        w.bool(tags[0], True); w.bool(tags[1], False); w.int(tags[2], 1); w.string(tags[3], "Honor Lance")
+        w.bool(tags[0], True); w.bool(tags[1], False); w.bool(tags[2], True); w.string(tags[3], "Honor Lance")
         w.begin("DSec"); w.int("ga", 1); w.end()          # sections stay generic
+        w.int("Dtc", 1); w.bool("Dwgv", False)            # the derived writer's tail
         w.end()
         return w.bytes()
 
@@ -491,8 +498,10 @@ class TagNameCorrectionsTest(unittest.TestCase):
         self.assertTrue(all(c.hinted for c in root.children[0].children[:4]))   # typed from the Des shape
         res = sr.read_bytes(data, padding="joint", strict=True, schema=schema)
         d = res.typed["Des"]
-        self.assertEqual((d["faiDes"], d["dHide"], d["dWep"], d["dName"]), (True, False, 1, "Honor Lance"))
+        self.assertEqual((d["faiDes"], d["dHide"], d["dWep"], d["dName"]), (True, False, True, "Honor Lance"))
+        # the section run stops at Dtc: the tail is NOT two more "reserved slots"
         self.assertEqual([s["_name"] for s in d["sections"]], ["DSec"])
+        self.assertEqual((d["dtc"], d["dwgv"]), (1, False))
         self.assertNotIn("FAIDes", d)                      # key stays R1's; only the tag changed
         with self.assertRaises(sr.SaveFormatError):        # camel-case R1 spelling is not on disk
             sr.read_bytes(self.design(("faiDes", "dHide", "dWep", "dName")),
@@ -779,6 +788,33 @@ class WireSchemaDefectsTest(unittest.TestCase):
             for d in pl["shipRecs"]["designRecords"]:
                 self.assertEqual(set(d) - {"_off"}, {"srd", "src", "srb", "srl", "sri"})
 
+    # --- lane D2: the Des record has THREE sections, and DWep/Dwgv are bools ----
+    @unittest.skipUnless(os.path.exists(os.path.join(REAL, "turn3-state.sav")), "real saves not present")
+    def test_design_records_hold_exactly_three_sections(self):
+        """The campaign's "five slots, 3 and 4 reserved" was this reader's own
+        `Rest()` sweeping Dtc and Dwgv into the section list.  Both design
+        writers are recovered: the base emits three DSec frames and nothing
+        else, the derived one appends Dtc and the Dwgv flag."""
+        seen = 0
+        for name in ("turn1-state.sav", "turn2-state.sav", "turn3-state.sav"):
+            path = os.path.join(self.REAL, name)
+            if not os.path.exists(path):
+                continue
+            res = sr.read_save(path, padding="joint", strict=True)
+            for pe in res.typed["sim"]["players"]:
+                pl = pe["Player"]
+                for key in ("designs", "legacyDesigns"):
+                    for d in pl.get(key, []):
+                        des = d["Des"]
+                        self.assertEqual([x["_name"] for x in des["sections"]],
+                                         ["DSec", "DSec", "DSec"], des["dName"])
+                        self.assertIsInstance(des["dWep"], bool)
+                        self.assertIsInstance(des["dwgv"], bool)
+                        self.assertFalse(des["dwgv"])      # never set in any save available
+                        self.assertNotIn("weaponGroups", des)
+                        seen += 1
+        self.assertGreater(seen, 100)
+
 
 class CliTest(unittest.TestCase):
     def setUp(self):