Ebb, do you mean 1/8" thick baffles or 1/8" thick walls?

I have planned to use 1/2" for the fore and aft bulkheads because if you're pounding to weather or just up onto the beach I figured most of the stresses introduced by the force of the water sloshing in the tank would be in the forward direction. But I have read some claims by individuals that a couple of layers of fabric on 1/4" ply is all you need.

The NSF paint!!! Something that is more expensive than epoxy!