Frameless steel construction
I've actually gone for a sail on a 36' Brent boat, and bought the plans for the 31'. I must tell you I was really impressed with how it sailed. It was faster than i expected, and tracked like it was on rails. The boats have a single chine that is slightly below the water line at rest. The boats hull is extremely fair,without any filler because the assembly method forces the flat sheet to have compound curvature. The build time for the hull is greatly reduced from other methods, weeks instead of years. However building a boat is a lot like building a house. The shell goes really quick, then all the interior detail takes much longer than you expect.
Beth Leonard & Evans Starzinger built an aluminum 47' boat. They had a yard weld up the hull, and while that was going on they built the entire interior in modules that fit through the main hatch. They built them one at time, in their apartment!