I think (maybe) still have a set of hoops from an old hot tub. You need to get someone (Jackleg, Ivey, etc) to saw you some 10/4 cypress and get it drying.
Now that's cool right there. Reminds me of the episode of Dirty Jobs where Mike Rowe is helping a company that builds water tanks in NYC. If I remember correctly, they made theirs out of cedar. :eusa_thin