I'm currently attempting to build a skin-on-frame kayak, as my first boat. The frame is 1/2' PVC pipe, made so I can disassemble it into many pieces for transportation. I'm contemplating different types of material for the skin, and this leaves me with a bit of a question. The forerunners so far are Marine Vinyl and Canvas. I know Marine Vinyl is waterproof, and canvas is not so it would have to be treated somehow (I don't know how). Is sewing required of whatever material I use, or can someone suggest a better way than going to an upholsterer? Anything someone could tell me about kayak skins would be helpful.