New homemade catamaran. stitch and glue plywood self-build (it’s easy but quite sticky). 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. I’m starting this topic to both log my experiments and to petition contributions and ideas from others. the basic premise, to build a strong, inexpensive inflatable boat..