From the moment you start building this 10′ dinghy you’ll begin to experience the sense of freedom and adventure that only owning a boat can offer.. 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:. Welcome to absolutely free plans, in this section you will find free boat building plans including accessories and construction techniques. free plans have a tendency.