Free boat plans for the backyard home builder, plywood and wooden sailboats, rowboats, dinghies motorboats. Wooden boat plans and kits. many boat plans are offered online. at first everything is very confusing, then you start to get some idea of the different types of boats available.. Drift boat plans. the transoms on these boats allow motors up to 9.5 horse for the 16′, 17′ and 18′..