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.. The original bruce roberts sailboat and powerboat designs & boat plans company in australia. boatplans & designs for steel, aluminium & wood/epoxy in either. Proven boat designs, and how-to information for boat building. boat plans are for beginners and have been built by thousands since 1953..