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[quote user="nucat78"] Unless you plan on putting a lot of weight on it, I think 5/8-in plywood is overkill.  If you want to keep the weight down, laminate foam or use thicker foam and thinner plywood.  I've had no sagging of 2-inch foam on 16-in centers with nothing under it aside from an occasional Masonite splice plate.  Mind you, I did not have huge amounts of plaster scenery on it nor did I climb on it (it was a shelf layout). [/quote] Thanks for the input fellows.  I really appreciate bouncing these ideas off those of you with experience before I go down and commit some $ to the plan.  I agree that the plywood under the 2" or 2 1/2" foam board that I want for the "shelf" section of the layout would be overkill.  I am sure I will just place it on large shelf brackets which come out on 16" centers from the wall framing.  Or I will caulk it to some mahogany veneer I have sitting around that looks about 3/16 or so. I say 5/8" under the 1" because this section will be large parts of the "dogbone" part of the layout and on the "table-top"of the benchwork frame. I have three of these areas will be about 6' X 8' in span.  I will have center "joists" within that.......but mainly, after looking at the sheets down at the local store, the stack of 5/8' look a whole lot flatter than the 1/2" at the moment.
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