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. Plans for building your own wooden kayak from scratch using the stitch-and-glue or cedar-strip method.. How to build a boat. little boats are perfect for trips around the lake. they fit on the roof of your car and in the back of truck beds, making them perfect for.