Skin on frame boatbuilding method. skin on frame refers to a method of boatbuilding that has been around for a very long time. typically a light frame often made of. 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. Welcome to absolutely free plans, in this section you will find free boat building plans including accessories and construction techniques. free plans have a tendency.