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Dougal, I guess I'm running against the grain here. I use 3/4" cabinet grade plywood because I don't want any problems with warp or sag. Most supports are on 18" or less centers. I have used 3/8"and 1/2" plywood in the past and have had sagging and warping issues. Many of these problems took years to manifest themselves. BTW: Another high quality ply is the Luan Mahogany (solid wood plys and no voids) My 2 cents, Guy
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