A large number of aluminum single hull (monohull) boat designs (plans) that serve a variety of purposes. these include orcas, outbacks, sitkas, sportsters, sport. Arch davis design – offering boat plans, kits, videos and dvds for the amateur boat builder including sail boats, row boats and power boats.. Boat design and boatbuilding projects, plans, concepts, reviews, and resources. sailboat, multihull, powerboat, and yacht manufacturers and custom builders. directory.