1. look up "hancor pipe company" on google.

2. Get phone number from their website.

3. Call 'em and discuss smooth-inside "cheap 15 inch pipe" They'll give you a model and a dealer near you. Expect to pay $120 for a 20 foot section - split with a sailing buddy. Stuff cuts with any kind of saw.



4. cut ends out of plywood. don't waste money on epoxy, use Spray on shellac from home depo.



Your cost: about 70 all up, assuming you or your buddy has old plywood lying around.