I had fun as a youngster building a cat with Plywood and sealing it with Fiberglass it was a very simple design as the hulls were esentially triangular Like the H16 and had a little rocker from being narrower at the front. I think a lot could be done if you somewhat copied the H16 and I bet you could even get already built parts like the mast and cross bars, But if you insist on inventing everything then remember that triangles are very strong. (sure you knew that but I felt like adding a coment)