Carolshutts I used 1/2" birch plywood on the bench and 2x3's for the frame. Believe me there is a ton of bracing under the bench! The first time I laid down on the original dinette in bed position the bed slipped through those tiny supports on the benches and I almost killed myself getting up. Oh I should mention I am 6' 3" 250 lbs so strong bracing is always foremost in my mind.
Larry
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