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Either way it will sag slightly in the middle. Defences are use some of the scrap plywood as ties across the cross 2x4 on the bottom or add an extra set of legs in the middle. I have a 4x8 layout on 1x4 stock with cross pieces on 16" center and it mildly sags enough that I test my rolling stock after tuning. If it rolls its good, if not then back to the bench.
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