Bruce roberts official web site powerboat plans power boat kits for steel boats or aluminum boat designs, cut to size boat kits, part built boats or complete boats. bruce roberts yacht designs offer boat building project management arrangements for boats built overseas at affordable prices.. Asymmetrical hulls are basically a monohaul craft split down the middle and spread apart. a foil assisted cat has a lifting foil between the two hulls to increase performance. one of the advantages of our aluminum catamaran is high initial stability. prices shown on this website are for plans and for a one time use of cad cutting files.. Steel and aluminum boat kits plus plans for all materials. boat plans designed for the home boat builder: on-line boat plans catalog, news letters, bulletin board, builder photos, how-to pages, and project registry. designers of all types of water craft, in all materials, for professional or amateur boatbuilders..