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.. Plans for wooden boats. how to build a row boat, skiff, and many other wooden boat design plans.. Build a simple wooden boat plans. these plans are called the "anyone’s boat", because as they claim, anyone can build it. you can power it with oars or outboard..