Boat plans for power, sail and small boats. free boat plans. kits and supplies plus the best boat building technical support.. 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:.