Woods that you don't have to seal?

[MikeYPG]

Piss will soak into anything. Id suggest you use Bath/Showe enclosure materials on the inside and seal all corners with Silicone. They sell 4x8 sheets at Lowes for $20.

good point lol, do you mind providing a link to the material that you suggest? would greatly appreciate it. A friend is doing a build and I am helping so will send the link off to him