These boats have been reported to be this country’s first mass-produced boat. while not a distinct american innovation, the "whitehall" evolved and was refined from. This boat is easy to build using our downloadable boat plans. our boat plans are available for instant download so you can start building right away.. 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.