Payap model v4: colour store, silos, two-storey finishing and print block

User, October 2026: ground-floor colour store plus outdoor silos; a
two-storey block at the east end with packaging below and printing plus
print and packaging stock above; in-house printing not decided, so the
print room is reserved only.

Model (rebuilt live in FreeCAD 26.3 after checking a copy of the saved
file for user edits; parametric check plot 150->160 m and upper floor
3.8->4.2 m passed):
- factory 128 x 25 m, plot 150 m (14.1 rai), corridor 98 m, fire wall
  at 106 m, new params crane_x (runway end = press hall end, 92 m) and
  mezz_z (+3.8 m);
- galvanics open to stamper prep (wall kept only on the material area
  and electrical side);
- colour store 10 m bay (~180 m2): two racking rows, ~100 pallet
  positions on 4 levels (estimate), weighing and mixing, vacuum
  conveying station; indoor silos replaced by regrind bins;
- 4 outdoor PVC silos (2 black, 2 standard colours, ~50 m3 each,
  estimate), big-bag filling station, buried conveying lines;
- finishing and print block 14 x 25 m: ground floor trim, optical
  inspection, QC, packaging (tables, shrink wrap, pallet wrapper), stair
  (Arch Stairs) and goods lift; upper floor print room (reserved), print
  stock, packaging materials.
New docs/cnx_vinyl_parametric_payap-block.png with both block levels.

Docs: site-candidates Payap section rewritten (areas ~3,800 m2 under
roof, ~4,630 m2 of floor), crane doc (98 m corridor, runway ends at the
press hall), README bullet and layout line.

README.md

@@ -130,9 +130,12 @@ The detail lives in dedicated documents:
 - [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: a 112 x 25 m production-only
-  factory with the five-press fleet, room for ten more Classics and one
-  shared hydraulic and air plant, a separate two-storey office building
+  on a square placeholder plot of Payap land: a 128 x 25 m production-only
+  factory with the five-press fleet, room for ten more Classics, one
+  shared hydraulic and air plant, a colour store with outdoor silos and a
+  two-storey finishing and print block
+  ([plans](docs/cnx_vinyl_parametric_payap-block.png)), a separate
+  two-storey office building
   ([floor plans](docs/cnx_vinyl_parametric_payap-office.png): canteen,
   changing rooms and showers, mastering and listening below; ~150 m² of
   offices, training room and IT above), a separate water treatment
@@ -240,6 +243,7 @@ docs/
 ├── cnx_vinyl_parametric_payap.png     Top view of the Payap model
 ├── cnx_vinyl_parametric_payap-iso.png Isometric view of the Payap model
 ├── cnx_vinyl_parametric_payap-office.png Office building floor plans
+├── cnx_vinyl_parametric_payap-block.png Finishing and print block plans
 ├── 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