( This is a worthwhile exercise for efficient use of materials, but we should note for the uninitiated that it isn’t necessary for compliance with competition rules. You can use multiple different plasic sheet types, so long as each material used is legal, and the set of parts you create (in their unbended state) can be tesselated inside a 12" by 24" rectangular frame. Folk without efficient cutters can go ahead and use scissors for a rough cut followed by filing back to a line, for example, and on multiple sheets. Answered: <R7.f> Clarification Request:"As cut from a single 12"*24" sheet" ref. area or perimeter? So don’t struggle to get your parts out of a single sheet.)