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.. Another great project for the lake house, this canoe boat rack plans set is from our free shed plans collection. make it easy with our step by step guide. this is part of our free shed and woodworking plans collection, and is available for instant access from our site.. Links to boat plans some free boat plans, boat building information including plywood stitch and glue. full range of boat plans from sophisticated yachts to plywood boxes as well as free oar and paddle plans..