Utilities: build the backbone once, add modules with the presses; four-module boiler hall and chiller compound

Phased build list for steam, cooling and hydraulics (launch, Duplex 1,
Duplex 2, Classic, options): everything cheap to oversize and costly to
retrofit (rooms, pads, headers and ring mains with a valved branch per
press position, tanks, HX frame, feeders, one sequencer) is built for the
five-press fleet at launch; boilers, chillers and hydraulic pump sets come
in identical modules as presses arrive. The Single 2.1 aggregate is
proposed as the first central pump set; per-branch isolation and filters.

Rooms sized for four modules each (user decision, estimates until vendor
footprints): boiler hall ~18 x 9 m for four 500 kg/h positions (fired case,
AIX DZL0.5 body), open screened chiller compound ~12.5 x 10.8 m with four
pads (250 kW at 40 C ~ Carrier 30RB 080-090), ~40 m2 pump and HX room; the
cooling tower pad of the water-cooled concept is dropped. Yard 178 -> ~379
m2. Four boilers carry ~8 presses with N+1; four 250 kW chillers carry the
five presses with CH-4 as reserve and no growth position unless the pads
take the ~350 kW frame (RFQ option).

- scale.md: yard table and basis, utility phasing section
- pressing-line.md: hydraulics phasing and re-quote questions
- steam-cooling.html: B-4 position, phasing and rooms card, details, RFQ
  questions (pw_sc_check clean)
- construction RFQ: yard table, sealed area 6,549 m2 (68 %)
- total-investment: added-scope row +73k to +122k USD (building rate on
  the ~200 m2 the yard grows by)
- Payap parts model: yard rebuilt from Params (blr_n, blr_inst, ch_*,
  bh_*, cy_*, pr_*), renders updated

docs/finance/phase1-construction-rfq.md

@@ -130,10 +130,19 @@ Simple industrial enclosures beside the main building.
 
 | Building | Area | Height |
 |---|---|---|
-| Boiler hall | 66 m² | 6.0 m |
+| Boiler hall, laid out for four 500 kg/h boiler modules | ~162 m² (18 × 9 m) | 6.0 m |
 | Biomass fuel store | 42 m² | 5.0 m |
-| Chiller room | 60 m² | 5.0 m |
-| Cooling tower pad (concrete pad only) | 10 m² | - |
+| Chiller compound: open to the sky, screened, four chiller pads (~4.0 × 2.6 m each) | ~135 m² (12.5 × 10.8 m) | screen ~2.5 m |
+| Cooling pump and heat-exchanger room | ~40 m² (8 × 5 m) | 4.0 m |
+
+The boiler hall and the chiller compound are built once for four modules
+each, and the plant goes in one module at a time as presses arrive
+([scale](../scale.md#detached-utility-yard-parking-and-what-that-moves)):
+price the floor, pads, plinths and wall openings for all four now. The
+sizes are estimates until the boiler and chiller vendors send footprints.
+Air-cooled chillers need open air, so the earlier "chiller room" is an open
+compound; the cooling tower pad of the water-cooled concept is deleted (a
+dry cooler, if bought, gets a pad sized with its quote).
 
 The 14 m flue stack comes with the boiler — excluded here. The boiler hall
 envelope should be non-combustible (mineral-wool panels or masonry), not
@@ -168,8 +177,8 @@ things follow:
 
 **On drainage.** 4,387 m² of pavement is about 46 % of the 9,567 m² plot,
 but the figure that matters for attenuation is the **total sealed area**:
-adding the main building (1,500 m²), utility yard (178 m²), guard house
-(12 m²) and parking canopies (271 m²) gives **6,348 m², or 66 % of the
+adding the main building (1,500 m²), utility yard (~379 m²), guard house
+(12 m²) and parking canopies (271 m²) gives **~6,549 m², or 68 % of the
 plot**. Quote the contractor that number, not the paving one.
 Runoff increases materially over the agricultural baseline, and
 stormwater attenuation — quite possibly a detention pond — may be required