Welcome to spira international home-built boat plans. spira international offers a wide variety of different power, rowing, and sailing skiffs, dories, and other boat. Simple plywood boat plans. michael storer wooden boat plans wooden and plywood boat plans for amateur boatbuilders. hannu’s boatyard is a site by a finnish guy who. Free plans: absolutely free plans (links to free online boat plans) ariawood boat works (plywood punts, jonboats and one-sheet boats) architectura navalis mercatoria.