Free plans for stitch and glue boatbuilding. many good free plywood contruction stitch and glue boat plan. stitch and glue plans are good wooden boat plans for beginners.. The merrimac can be made from 3 sheets of 4′ x 8′ (1.2m x 2.4m) plywood. one additional sheet (actually less than 1/2 sheet) will be required to make temporary frames.. 1 sheet + is an attempt to make a nice looking, good performing small boat out of a single sheet of plywood. with a 30" beam and a length of 88", the boat achieves 4.