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 designs that are simple to build, rugged and seaworthy.. Bruce roberts official web site powerboat plans power boat kits for steel boats or aluminum boat designs, cut to size boat kits, part built boats or complete boats. bruce roberts yacht designs offer boat building project management arrangements for boats built overseas at affordable prices. sailboat and powerboat building plans and kits available for building steel boats, fiberglass boats. Free boat plans for the backyard home builder, plywood and wooden sailboats, rowboats, dinghies motorboats.