A 40 watt CO2 will cut about 3mm plywood easily and if you really hammer it you can get about 6mm. Acrylic it will cut about 4 or 5 without hammering it too much.

I bought loads of the 40 watt ones form China, sold most but still have one that I converted to ramps. I have had it more than a year and have never used it other than testing when I put Marlin on.

They are not as useful as you think.