Here’s a Finnish guy who has worked up a bunch of free plans for making a wide variety of boats out of a single sheet of 4×8 plywood. He also has a few boats that use more sheets, like the dory pictured which uses 3 sheets.
Of course, using minimal materials is no guarantee of easy building. Fear not. Hannu keeps ease of building right up there on par with minimal materials. The goal is boat building liberation.
https://www.gsahv.pp.fi/index.htm#XX7=0A=0ACheers!=0AEverett=