You know those mini r/c boats? Well it would be cool having a puchi maru and making it proportional with a rudder. Upgrade motor better designed hull and more cells. Just the usual. Redesigned as in single prop smoother hull more hydrodynamic and say a 3/4 in ch long prop with half-inch below a 3/4 inch tall boat? Use a perfection 4.2 for speed and a puchi servo for rudder control. LOL