Find a variety of fishing boat design plans for all power boats 16′ long and under. our power boat building plans make it very easy to construct your own!. Inboard racing classes consist of both runabout and hydroplane classes. you can tell a boat’s class by the letter(s) next to the boat number.. 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..