My son and i built this simple one sheet plywood boat following the plans and sage advice provided in the following link…. 1. q: my plans call out long sheets of plywood, where can i find them? a: we have a list of lumber suppliers on our web site that may have a source, however, long. 1 sheet + is an attempt to make a nice looking, good performing small boat out of a single sheet of plywood. with a 30" beam and a length of 88", the boat achieves 4.