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Construct the legs from 4 x 4 lumber. If the workbench is to be, say, 8' long, six legs are required. Any less and you risk bowing when working on something heavy. Lag bolt into the concrete wall. Top can be 2 x 4 or 2 x 6 frame. Cross members of 2 x 6 every 2 feet (16 inches would be better) set 23/32 below the top of the frame. This allows for a 3/4" plywood top which is screwed to the cross members and when it gets enough nicks and abuse can be either turned over or replaced. Actually, I placed mine an additional 1/4" beneath the frame and covered the plywood with hard masonite. I did not consider metal because metal tops are slippery, something you do not want. Use screws for all joining; much more secure than nails. To eliminate any possibility of "racking", the ends should be covered with plywood. Don't forget shelves under the bench and even a few drawers for hand tools that you might not want to hang on a pegboard wall (hammers, other heavier items, planes, etc)
Just some ideas. Mine are built this way and I think I could park a small truck on them.
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Bob S. former owner of a 1984 silver 944
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