See more of the jon buoy in the builder’s gallery. jon buoy is another in my series of easy-to-build, multi-purpose boats. this extremely popular type is called a jonboat.. Spira international wooden boat plans. following are the stock plans available for the various types of boats, separated into the different categories.. Plywood boat plans. 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 fishing boat at a very affordable price..