Plywood kayak designs (stich & glue) including plywood construction plans and stitch and glue kayak manual.. Woosung has been producing various innovative styles of inflatable heavy-duty drop stitch sup with our selytech glue from the start. we have been introducing mainly 3. The hull is plywood, built over a jig. most of the “jig” becomes permanent structure. this is not a stitch and glue “introduction to building type of boat” if.