Boat plans for the 18 this larger version of the popular 15′ dinghy is in many ways an improvement and it is more seaworthy than the 15′ version.. 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.. 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.