My table is 70" x 50" and I think 70" is the bare minimum I would go. 48" would work for depth. My MDF spoilboard is 49" x 40" and is too deep if I want to tile. It may not show up in the pictures but my spoilboard cutter couldn’t reach the ends. It’s not too much of an issue as I could use a hand plane to remove the lip if needed.
I have a little over 8" between the controller and the Y axis and that is barely enough. The controller is mounted to a block of wood and hangs over the side. While it doesn’t look like it would there’s the possibility of the X and Z axis wire getting caught on the E stop button.
The table is made from 1 1/8" Advantech subfloor plywood. The stuff is very strong.