Hi thanks for the reply.

I have been looking at photos of other machines to see what others do.

For the z axis I will use a ball screw.

For the 2.5m axis I'm concerned the belts will be too stretchy, I have enough belt for both sides but only one set of pulleys so I don't have the parts to just try it without spending money. Don't want to throw good money after bad so am thinking of rack and pinion.

The belt drive is already mounted and setup on the 1.3m axis so am tempted to just try that and see what happens.

I've been looking at spindles. I have an spare inverter here that will run a 2.2kw spindle but from what I've read a 4 kW would be more useful so I think I will order a vevor air cooled then then I can start work building the frames up and take it from there.