"i am really enjoying the plans. based on the amount of information provided, and the quality and quantity of the diagrams, i have to say i am excited about this boat. 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. We have power boat building designs of all types such as power cats, cruisers, and more. view jon boat deck plans & boat cabin plans for more details..