Production hall: rough BIM layout sketch

FreeCAD BIM (Arch) sketch of the 60 x 25 m phase 1 hall:
Building > Ground floor with Spaces for every zone (areas computed),
room-in-room partitions, the fire wall at 48 m, the 5 t crane runway,
and the main equipment as BIM Equipment (Pheenix line, Sibert row,
Newbilt Duplex and two Classic presses, silos, racking). Zones run in
process order along the visitor corridor. Top-view PNG alongside.
Linked from the README and from the crane doc, with the one conflict it
shows: reception and cutting room under the crane travel.

README.md

@@ -111,6 +111,11 @@ The detail lives in dedicated documents:
   end, and a glazed ground-level corridor for guided tours without noise,
   dust or plating chemistry; what each changes in the building and what
   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
+  corridor, the crane zone, room-in-room boxes and the main equipment; every
+  position is an estimate
 - [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
@@ -211,6 +216,8 @@ docs/
 ├── 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.png    Top view of the sketch
 ├── production-timeline.md Order turnaround, stage by stage
 ├── project-timeline.md    Calendar to first paying release, critical path
 ├── quality-automation.md  Stamper metrology and layered record QC