Has anyone else used Gyproc coving adhesive for modelling? Back in the early Seventies I had a commission from the MOD contractor firm I worked for to produce a part sectioned half submarine hull of about 3 ft. Sectioned areas were the control room and weapons control compartment.
I used ply bulkheads on a hardwood wall mounting board, with a balsa-planked skin to get the shape. The nice thing with Gyproc adhesive is it is in powder form, mixed with water to the consistency needed, and it applies easier than plaster, smoothing with a damp cloth. Within about quarter of an hour it is as solid as concrete but still easy to sand to a smooth finish.
OK, this was a static model and the material was probably too heavy to shape a working model in this form, but I have since used Gyproc sparingly as a finishing filler on a steam driven HMS Cressy I built a couple of years later.