Thanks, all--I ended up using standard PT plywood and, would you believe it, found 3 FLAT pieces at Lowe's. We'll see how long that lasts!
One more question: I'm thinking things will last longer if I treat it, especially the sides which have the long edges of plywood exposed. I'm thinking of using caps or just loading up on treatment--the latter would be quicker, cheaper, and work for all the wood. Suggestions?
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