Pontoon boat. here are plans for an easy to build pontoon boat. this pontoon boat measures 12 ft long, has room for 3 adults and is great for using in still waters.. Wooden boat plans for amateur boatbuilders – excellent performance, simple construction, step by step instructions australia, usa, uk, hungary, s. africa. Boat plans for a 12′ to 28′ pontoon boat made from plywood for the amateur boatbuilder..