Payap scenario: parametric BIM model of the whole plant on a square plot

A separate FreeCAD 26.3 model (the Mueang Chi model is untouched) sites
the plant on a 110 m square placeholder plot of Payap land, built from
BIM objects (Arch Site, Buildings and Levels, walls, slabs, columns,
beams, a ramp, Spaces with computed areas, Equipment). Every object sits
on an expression-driven base, so the Params sheet drives plot, setbacks,
floor level, building sizes, fire wall line and office gap (checked:
plot 110 to 120 m and factory 84 to 90 m, everything followed).

- Factory 84 x 25 m, production only, in process order along a 54 m
  glazed corridor; press hall 465 m2 with the October fleet (two Duplex
  systems, each EX 50 + EX 35, and the Classic); crane to the fire wall;
  machine door and 12 m ramp at the north-west corner.
- Office building 24 x 15 m, 12 m away on its own slab with a covered
  link: reception, offices, meeting/training, mastering and cutting,
  listening, IT, archive. Resolves the crane-zone conflict of the old
  sketch.
- Utility yard behind the press hall (boiler and chiller flagged for
  re-sizing), gate, truck apron, car park, service road.
- site-candidates: new section and plot-fit note; crane doc: conflict
  resolved, 54 m corridor; README bullet and layout lines; the old
  sketch is labelled as Mueang Chi with the earlier fleet.

README.md

@@ -123,9 +123,17 @@ The detail lives in dedicated documents:
   it costs
 - [Production hall layout sketch](docs/production-hall-layout-sketch.png):
   a rough BIM sketch in FreeCAD (`docs/production-hall-layout-sketch.FCStd`)
-  of the 60 x 25 m phase 1 hall: zones in process order along the visitor
+  of the 60 x 25 m phase 1 hall at Mueang Chi, with the fleet before
-  corridor, the crane zone, room-in-room boxes and the main equipment; every
+  October 2026: zones in process order along the visitor corridor, the
-  position is an estimate
+  crane zone, room-in-room boxes and the main equipment; every position is
+  an estimate
+- [Payap scenario model](docs/cnx_vinyl_parametric_payap.png): a parametric
+  BIM model in FreeCAD 26.3 (`docs/cnx_vinyl_parametric_payap.FCStd`,
+  [isometric](docs/cnx_vinyl_parametric_payap-iso.png)) of the whole plant
+  on a square placeholder plot of Payap land: an 84 x 25 m production-only
+  factory with the five-press fleet, a separate office building for
+  offices, mastering and IT, the utility yard and site access, all driven
+  by one parameter sheet
 - [Process logging and traceability](docs/traceability.md): end-to-end
   per-order traceability for customers, batch genealogy from audio file to
   shipment, and the requirements this sets for the factory software
@@ -224,13 +232,16 @@ docs/
 ├── artist-platform.md     Upload, price calculator, fan-funded pressing
 ├── biomass.md             Biomass fuel strategy and the 60 rai coppice idea
 ├── boi.md                 BOI promotion strategy and requirements
+├── cnx_vinyl_parametric_payap.FCStd   Payap scenario parametric BIM model
+├── cnx_vinyl_parametric_payap.png     Top view of the Payap model
+├── cnx_vinyl_parametric_payap-iso.png Isometric view of the Payap model
 ├── crane-workshop-tours.md Overhead crane, workshop, visitor corridor
 ├── digital-factory.md     Data platform, NixOS/Clan fleet, acquisition, app
 ├── facility-security.md   Security, HVAC, fire and life safety, compliance
 ├── payap-partnership.md   Joint student programmes with Payap University
 ├── plant-operation.html   Animated plant overview (simulated SCADA)
 ├── process-flow.md        Audio file to delivered record, with all checks
-├── production-hall-layout-sketch.FCStd  Rough BIM layout sketch of the hall
+├── production-hall-layout-sketch.FCStd  Rough BIM sketch, Mueang Chi hall (earlier fleet)
 ├── production-hall-layout-sketch.png    Top view of the sketch
 ├── production-timeline.md Order turnaround, stage by stage
 ├── project-timeline.md    Calendar to first paying release, critical path

docs/crane-workshop-tours.md

@@ -297,6 +297,18 @@ conflict to resolve: with the workshop at the ramp end, reception and the
 cutting room sit under the bridge's travel too, against point 6 above
 (cutting room outside the crane zone).
 
+The Payap scenario model
+([cnx_vinyl_parametric_payap.FCStd](cnx_vinyl_parametric_payap.FCStd),
+[top view](cnx_vinyl_parametric_payap.png); see
+[site candidates](site-candidates.md#payap-scenario-model-october-2026))
+resolves that conflict. Mastering and cutting, the offices and IT move
+into a separate office building, so only production sits under the
+crane. The tour then starts in the office building, at the cutting-room
+window and the listening room, and crosses a covered link into a 54 m
+corridor, inside the 45 to 55 m assumed below. The model also draws the
+five-press fleet of October 2026; the sketch above still shows the
+earlier fleet (one Duplex and two Classics).
+
 ### How it is built
 
 - **Room-in-room**: a glazed wall on the production side, a solid roof at

docs/site-candidates.md

@@ -86,7 +86,9 @@ pharmaceutical facility on the offered land is to be confirmed.
    above ground for the loading docks, helps but is not a flood
    assessment.
 5. **Plot fit.** Shape and size against the 60 × 25 m building, the
-   detached utility yard and the phase 2 footprint (6 to 8 rai).
+   detached utility yard and the phase 2 footprint (6 to 8 rai). The
+   Payap scenario model below fits the whole plant on a 110 m square
+   (7.6 rai) as drawn.
 6. **Galvanics on a campus.** Phase 5 electroplating needs the lessor's
    written consent; the zero-discharge design
    ([sustainability](sustainability.md)) becomes a lease condition, not
@@ -102,3 +104,64 @@ Nothing has been re-sited. The parametric model, PV roof study, RFQ and
 the fleet site code `lpn` in the [digital factory](digital-factory.md)
 stay on Mueang Chi until a Payap plot is known and has passed checks 1
 and 2.
+
+### Payap scenario model (October 2026)
+
+To see the plant on Payap land before a plot is known, a separate
+parametric BIM model sites it on a simple square plot:
+[cnx_vinyl_parametric_payap.FCStd](cnx_vinyl_parametric_payap.FCStd)
+(top view [PNG](cnx_vinyl_parametric_payap.png),
+[isometric](cnx_vinyl_parametric_payap-iso.png)), built in FreeCAD 26.3
+from BIM walls, slabs, columns, spaces and equipment. Every size and
+position hangs off its `Params` spreadsheet (plot side, setbacks, floor
+level, building sizes, fire wall line, office gap), so the square can be
+swapped for the real plot once Payap names one. It is a layout sketch:
+every position and every equipment envelope is an estimate.
+
+- **Plot**: 110 × 110 m (12,100 m², 7.6 rai, inside the 6 to 8 rai of
+  [scale](scale.md)), road assumed on the south side, 6 m setbacks
+  (placeholder).
+- **Factory, production floor only**: 84 × 25 m at floor level +1.2 m,
+  in process order along a 54 m glazed visitor corridor. From west to
+  east: staff entry and lockers; workshop and spares, with the machine
+  door and a 12 m vehicle ramp at the north-west corner; galvanics clean
+  room and water treatment; stamper prep, PVC lab and material area;
+  compressed air and electrical; the press hall; trim and optical
+  inspection, QC lab, and finishing and packaging. Behind the fire wall
+  at 62 m are the warehouse and dispatch with two dock doors.
+  - The press hall (465 m²) holds two Duplex systems, each two HRP 12
+    presses with an EX 50 and an EX 35, and the Classic
+    ([pressing line](equipment/pressing-line.md)).
+  - The 5 t crane runs from the west wall to the fire wall
+    ([crane, workshop and tours](crane-workshop-tours.md)).
+- **Office building, isolated from the factory floor**: 24 × 15 m, single
+  storey, 12 m south of the factory on its own slab and structure, joined
+  by a covered link that lands at the start of the visitor corridor.
+  - It holds reception, offices, a meeting and training room (the
+    [Payap programmes](payap-partnership.md)), mastering and cutting with
+    an inner acoustic lining, the listening room, the IT and server room,
+    the archive, and WC and kitchen.
+  - The lathe sits away from press vibration and outside the crane zone.
+- **Utility yard** behind the press hall, across a 6 m service lane:
+  - boiler house with chimney and a covered fuel store;
+  - chiller and cooling tower;
+  - process and fire water tanks;
+  - PEA transformer;
+  - a pipe bridge to the press hall.
+
+  Boiler and chiller are drawn at the one-Duplex sizes and need
+  re-sizing for five presses ([scale](scale.md)).
+- **Access**: one gate on the south side opens onto a truck apron in front
+  of the dock doors, with the car park in front of the office and a
+  service road round the east end to the yard and the ramp.
+- **Area**: about 2,100 m² of factory plus 360 m² of office, so ~2,460 m²
+  under roof. That is above the 1,400 to 2,000 m² of the [scale](scale.md)
+  zone table, which held one Duplex and an automated zone with the offices
+  inside.
+  - The press hall matches the new fleet.
+  - Warehouse and dispatch (~530 m²) are drawn above that table's 300 to
+    500 m² for packaging and finished goods.
+
+  Both are estimates to settle against the real plot.
+
+The Mueang Chi model and everything sited on it stay as they are.