Notes on the construction:
Foundations were made of wooden beams and wires, and the surfaces of the houses were completed in plaster, polyurethane foam (a chemical mixture resembling bread dough, which could be sprayed from a gun, easily molded into any desired shape, and which hardened into a cement-like consistency), and fibreglass.[4] Creber recalled, "the studio at the time had been experimenting with a substance called polyurethane foam, and one day, some fellows had attempted to build something with this foam by spraying it on cardboard, and it had the exact look we were after. So we sculptured the buildings, using 1/4 inch models, with welded rod, covered with cardboard and they’d spray them with foam. Towards the end, we didn't have enough equipment, and we weren't making good time, so we had to go into plaster and cement construction, plus the foam