Thanks. I could not find the one that you were talking about but I did see this one and it looks like something to work off of.

http://www.mackspw.com/item.asp?im=DJP100&d=DJPS_Surf_n_Swamp_Adjusta ble_Hunting_Seat

Do you have a link for the PVC one? I would with PVC a lot so yea I can make it if I can see it.