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A torsion box would still be top and bottom sheet, wouldnt it?
Top and bottom sheet, with a 'webbed' core. They are supposed to be incredibly strong, stiff, and flat, and they don't weigh as much as multiple thick ply. For example, my bench has a double thickness of mdf for the tip, with a quadruple thickness around the edges so I could put bench dogs in them.
Since they have the support structure all throughout the inside, you don't really need the 3/4 sheets. Depends on what you want it for. A work table or assembly table? You could probably get away with 1/4" skins.
I know there are a few guys on here who have built them... They probably have more info than I do.