Build an atom KIT for contemporary European residential architecture (Swiss / Dutch / Scandinavian 2020s): villas,
terrace houses and small apartment blocks. Reference: sheet.png here (villa, apartment block, detail panel). Your dir:
/root/fal-author/modern-atom-kit-v1/ (here: ~/forge-build/forge-assets/jobs/modern-atom-kit-v1/). For the level of detail
expected, look at ~/forge-build/forge-assets/jobs/breton-atom-kit-v1/kit_sheet.png and its build_kit.py (read-only).

HOW THE ASSEMBLER BUILDS THESE: walls are GENERATED panels (0.35 m thick) in a wall material; flat roofs are generated
slabs with a parapet; facades follow a strict grid (bays of 1.5-3.0 m, storey 3.0 m). You provide:
- window_tall: 1.20 x 2.40 clear opening (floor-to-ceiling feel, sill 0.10), dark bronze aluminium frame, deep reveal
  lined in aluminium, thin projecting sill. SAME on every storey. [2000]
- window_std: 1.20 x 1.50 (sill 0.90). [2000]   window_ribbon_1m: 1 m module of a horizontal ribbon window 1.30 high
  (the code repeats it; mullion at its left edge, end_mullion atom closes the run). [600] + ribbon_end_mullion [80]
- glazing_slider: 2.80 x 2.40 sliding door to a garden/balcony. [2500]
- door_pivot: 1.20 x 2.40 pivot entrance door (Door_paint panel, long bar handle). [2500]
- shopfront_bay: 3.00 x 3.00 frameless shop glazing with a glazed door on the left third. [2500]
- balcony_steel: 2.40 wide cantilevered concrete slab (1.4 deep) with a vertical-bar steel railing. [3000]
- canopy_concrete: 2.0 x 1.4 thin cantilevered entrance canopy. [300]
- parapet_coping_1m: metal coping on a 0.35 wall top. [80]   parapet_corner (outer corner piece). [100]
- roof_rail_1m: thin steel roof-terrace railing. [200]
- downpipe_square_1m [60], rainwater_head (box at the parapet top where the hidden gutter drains) [200], downpipe_shoe [60].
- roof_skylight: 1.2 x 1.2 flat roof light. [400]   roof_vent: small steel vent cowl. [200]
- planter_concrete: 1.6 m long planter with grasses. [1500]   bike_rack [400].

SHELF (names exact): Render_white (mineral render, slight trowel texture, Height small), Render_grey, Concrete_boardmarked
(vertical board marks, tie holes, Height), Larch_cladding (vertical boards 120 mm with 8 mm shadow gaps, Height),
Larch_cladding_charred (dark shou sugi ban variant), Bronze_aluminium, Glass_clear (dark reflective), Steel_dark,
Zinc_coping, Roof_gravel (flat roof), Paving_concrete, Door_paint (neutral light paint for tinting).