Looking at building the tank out of plywood and coating the inside with a one-part epoxy paint. For this project, I'm thinking this would be a better option than using EPDM liner. Wondering if others have done this, and what were the results. I know a guy who built a large commercial water tank using the epoxy, and he says in that application it was the best way to go. If you built another one, would you go this way, why, and how would you improve it?