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. 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.. If you have a trailer that you would like to convert into a drift boat trailer, we can assist you with the design changes required and provide drawings to assist you..