This boat is easy to build using our downloadable boat plans. our boat plans are available for instant download so you can start building right away.. We have dinghy boat plans for dinghies up to 12′, most of which can be used with oars, sail, or small outboards. find dinghy sailboat plans at bateau!. How to build a small sail boat. these plans are for a small sail boat called the biloxi dinghy. former builders claim it’s a great design.s. from the plans:.