Looking to build another cnc specificially for solid surface carving

[JohnHaine]

Do you mean gears? Using ballscrews the last thing you want is backlash in gears. But reduction using toothed belt would be fine. For precision better to use a bit more mechanical reduction than higher microstep ratio.

I machine Corian a lot, wonderful stuff. I only have 5k rpm max spindle and I find I can take deep and fast cuts quite happily using standard milling cutters. So maybe you don't need a very high speed spindle which could reduce your noise level?