If you are using 2X lumber for the framing, you could straighten them with a table saw like Dan said. If you are using 1X lumber for framing, you could straighten them the same way or make them into L girders. You could also put shims between the plywood and the framing to make adjacent tables level. There are also better grades of lumber in both 2X and 1X. I have used clear 1X pine to make pine cabinets. More expensive, but the clear pine at Home Depot is fairly reasonable.
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