General purpose 21′ hull, several wood boat plans to choose from. learn how to build a plywood boat with any of these options: work boat, tour boat, bass boat, deck. Boat plans for the 21 here’s what you’ll receive when you order this plan from me… plan, profile and section drawing. Proven boat designs, and how-to information for boat building. boat plans are for beginners and have been built by thousands since 1953..