Framing the walls with 1 X 4 strips was a very good idea. The sheets of 1/4" plywood lay flat now with almost zero warping.
I used my table saw to make a base board from a 1" thick piece of TREX composite decking. That way spills on the floor won't wick up into the plywood.
I used my table saw to make a base board from a 1" thick piece of TREX composite decking. That way spills on the floor won't wick up into the plywood.