Free boat plans from "science and mechanics", "boat builder handbook" and other very old magazines. trouble viewing? try the low band width index.. A large number of aluminum single hull (monohull) boat designs (plans) that serve a variety of purposes. these include orcas, outbacks, sitkas, sportsters, sport. Free pontoon boat plans. well look what we have cooking here: free plans to make your own pontoon boat! length: 12′ (3.7 m).