@Carl - will you be enclosing the cnc? If so, you need to leave a bigger footprint because the walls need to attach (mine is 52” x 49” and I wish I was an extra 1 or 2 inches wider. Note that when the sweepy is attached to the router the unit will go beyond the footprint and hit the front glass doors if the unit is not deep enough.
My suggestion is to troll the pages on this forum and look for the table/enclosure style you like best, then post a link and ask for the measurements, source, etc
On another note - there is a great how to guide in torsion table tops - the pdf file is available on this link Torsion box ( long winded) - #2 by gdon_2003
One key: when the majority of people built/made tables lumber was at reasonable prices. Right now, sheet goods are crazy expensive. It might make economical sense buying two standard tables and hooking them together