Free boat plans for the backyard home builder, plywood and wooden sailboats, rowboats, dinghies motorboats. If you are looking for a way to build an inexpensive boat you should definitely consider plywood boat plans. using plywood is one of the best ways in which to build a. "one sheet boats" are simple boats made basically of a single sheet of plywood. these boats are typically easy, quick and cheap to build, so they are very suitable.