The design of 2 extra boards beyond the bridge had to include a siding off the main line that went onto the adjacent fiddleyard. Lots of factory purposes and designs were discussed and trialled with cardboard models of different layouts, wall materials (brickwork was favourite), roofs and windows etc. How to disguise the route onto the fiddleyard was critical, and gates into a single building were was a possible solution. Eventually we decided on two factory buildings clad in corrugated iron. At some point, the idea of a stonemasons sealed the design, which allowed deliveries direct from the quarries and onward delivery of prime stone products and debris down to the mainline.
2 x 5mm layers of foamboard formed the base of the buildings which were soon finalised. Standard A4 sheets of plastic corrugated iron were initially planned, but the resin printer meant homemade cast-iron sheets were possible. An accurate, standard cast-iron sheet was drawn using the manufacturers information, complete with bolts and standard overlap adjustment (suitable for cladding and roofing). Different sizes and special sheets were a 'doddle' and the CI sheets were glued on with Bostic. 3D printed gutters & rainwater features closely followed with windows and the building became reality.