There used to be a company called Sea Bright Kayak Co that sold pvc kayak kits. Never found out any other info but here is someone who built one. If you find out any more let us know!

Good Luck Paul.

: Hey, I was wondering if anyone could help me out. I need to make a boat for a
: recycled boat race. I'm thinking a Kayak design might win it for us this
: year (other designs have been way to heavy). So i was wondering if anyone
: could send me a schematic of what a basic two person Kayak looks like. The
: plan right now is to build it out of PVC pipe (needs to be kinda cheap
: too) but if anyone has any other suggestions it would be appreciated.
: Either reply to this or e-mail me at glaceria@hotmail.com