Hi milos, plywood used for kayak on pictures and videos is a regular one. this same non waterproof plywood is used in doubletrouble too. and for more then a 3 years. Qivitoq: the qivitoq. the qivitoq was the first boat i designed and actually built. 17′ 6" loa, 24" beam. kayak #11: stitch+tape kayak #11 #11 is a stitch+tape kayak.. Free kayak and canoe plans what is the difference between free and paid for plans? often nothing! proven free canoe and kayak plans have been made available.