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 scantlings are very generous: this boat is overbuilt but despite that, thanks to the material, she is still much lighter than most boats in her. How fast does it go? for estimating the speed for small outboard planing boats see planing speed boat chart. this chart should be used for general estimates only..