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The shingles were divided into types row by row and mounted on two layers of thin, bendable plywood cut to fit the steel substructure exactly. The inner layer was marked with two sets of lines, one to align it with the steel behind and one to position the outer layer. The outer layer showed where each shingle belonged. Each of the more than 1,400 parts was engraved with its type and assembly location, so the installers needed no marking plans on site and knew the sequence and position of every part. Each shingle was cut and folded from flat sheet. Its return folds interlock with the neighbouring shingles on all sides and make the fit watertight, on the principle of fish scales. In the 3D model we developed a flat version of the shingles with the return folds unfolded for fabrication, and a bent solid version for visualisation and clash detection.
Axonometric views showed the instructions for each assembly stage, and a set of details was taken automatically from our 3D model and that of the steel fabricator. The aim was to keep the number of drawings to a minimum by embedding all information needed for assembly in the parts themselves. As no 3D scan of the steel structure was available, we gave the fabricator a template drawing for filling in the key dimensions, which we then used to adapt the parametric model to the structure as built.