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. Barnplan.com . free barn plans: download free plans for small barns, workshops, pole barns, big farm barns, garages, sheds, horse barns and country outbuildings. Free wooden boat plans for other sailboats. back in the old days, there were a lot of simple plywood boat plans in magazines, most popular were sailboat plans, canoe.