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. Boat plans for the 16 designed to heavy weather and sea conditions, this 16′ sea power ensures a calm ride so you and your crew won’t get thrown around when the. Devlin’s boatbuilding: how to build any boat the stitch-and-glue way [samual devlin] on amazon.com. *free* shipping on qualifying offers. why is stitch-and-glue.