Proven boat designs, and how-to information for boat building. boat plans are for beginners and have been built by thousands since 1953.. Many of stitch’s "cousins" are featured in this group photo taken at the end of leroy & stitch. the experiments, also referred to as stitch’s cousins, are genetically. 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..