can i also add, dont get to discouraged about cutting hard material with cnc machine.

It just means slow spindle speeds/cooling and long job times, but for what your doing, that would not be a problem, you may be able to pull off what you need for around £ 1000, £ 3000 would be easyer, £ 4000/5000 you could do it without worry

Wadkin LS Router - damaged | eBay
WADKIN LS OVERHEAD PIN ROUTER 3 PHASE WORK HORSE LOTS OF PINS AND COLLETS | eBay

a good example of a cheap starting frames you could retrofit. look around, you might find one that you can gear the spindle to the right speed for you.

Then fix XY to that solid table top,