I took the entire week off to build a CNC table for my new Shapeoko 3XXL. I researched several plans on the web and on CNC forums and found the assembly table that The Wood Whisperer built met the requirements I was looking for in a CNC table.
Dead flat top
Twist resistant top
Space for my laptop to run the cnc and design
Ledge in front for overhang and tool staging
Storage on both sides of the table with drawers and door storage
Built like a TANK to avoid any shaking or vibration
Last month I researched making a table top and once I saw the video that The Wood Whisperer made, I knew that was the one I wanted to build. My torsion box will be very similar to the one that you made, except mine will have wiring concealed within it and each “cell” will be filled with acoustical foam. What are the dimensions of your torsion box? Job well done!