ARCHITECTURAL SCALE MODEL BUILDING SUPPLIES: N, HO (1/8") O (1/4") Scale Miniature Windows, Doors, Gable Trims and Building Parts and Components. House and Building Siding Plastic Pattern Sheet Stock and Roofing Plastic Pattern Sheet Stock. Structural Engineering Beams, Columns, Trusses, Pipe, Pipe Fittings, Valves, Tubing, Tanks, Oil Storage, Vessel Heads, Skylights, Steps, Stairs, Ladders ...