While reading this old thread I noticed post #3 which mentions gluing a piece of rigid foam between two pieces of plywood to make a router table, torsion box, etc.

https://sawmillcreek.org/showthread....uter-Table-Top

Has anybody ever tried this? If it works it seems like an easier way to make a torsion assembly table top. I think you could glue them together with clamps, cauls, weights, etc. instead of a vacuum bag. Comments?