The ultimate multihull design and building resource – catamarans and trimarans to 150 feet. Boat plans by mike waller yacht design. quality plans for amateur boatbuilders, monohull and multihull, catamarans, sharpies, skiffs, power catamarans and sailing. Links to boat plans some free boat plans, boat building information including plywood stitch and glue. full range of boat plans from sophisticated yachts to plywood.