I originally built mine as 24"x24" on a single piece of 3/4" particleboard with no other support. This was just a “test build” before I expanded it to my final size of 34"x48" so I could easily fit 20"x30" sheets of foam board.
I REALLY liked it as a 24"x24" machine. I built it on our dining room table, so I had to move it every night for dinner. I worried that with just a sheet of particleboard and no bracing moving it around all the time it would shift things and not hold level/square. But it actually held great. I never had to make any adjustments once it was dialed in.
That said, I wouldn’t suggest it for a long term solution. If I was going to keep it that size and move it around a lot I’d have probably added a torsion box style base to reinforce the particle board.
I eventually built my bigger table:
And got the machine enlarged. But I still have that original base and use it as a waste board now:
If you look closely you can see some black squares - those were the original working area which came out closer to 13" with the 24" frame.
You can also see another black outline with curved edges - that’s a laser scar from cutting a thrust tube for this guy I finished this weekend:
Not bad for 5 sheets of foamboard from the dollar store. 10-15 minutes each to cut on the machine took me right about an hour (then 2 weekends of assembly.)
In fact I liked my 24" machine so much that if/when I finish my low-rider I plan on rebuilding my MPCNC back to 24". It was MUCH stiffer at that size and I was able to do traditional milling on wood and plastic much faster than I am with it at it’s current size.