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. Boatplans.dk – online free and inexpensive boat plans for canoes, small boats, sail boats, motorboats and powerboats. download boat plans right away. – boatplans.dk. View our collection of diy sailboat plans that feature boat design for sailboats of all types! we have sail boat plans for yachts, day sailers, and more..