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.. Below are free plans from the web for building a plywood boat. over 40 free plans. boating is full of thrill and adventures, and you will be glad to make it a part of your camp plans. you can make a plywood boat easily and without spending too much. but be very careful while you build that you are building a safe boat.. Wooden boat plans and kits. they also have plans for many wooden boats from a 6 foot pram to a 28 ft cruiser. old plans by percy blandford; spira international has boat plans, dory style drift boats, kayaks, ultralights and power boats. free kayak and a free dory plan. good website..