[CAD_CAM_EDM_DRO] newbie Question

Hello all,

ive been looking at this group for a little while now. I will be purchasing
a vertical mill very soon, Performa, ZX 7550, Knee mill, 9.5 by 32 inch
table, powerfeed etc. Weight about 600Kg. Also 3 axis Easson 3 axis DRO.

I plan on doing a CNC fit to it at some stage, has anyone here done a
machine this size? most of what i read here is on the smaller machines. I
realise that programming would be the same, any ideas on what size/ torque
stepper motors i need to source.
Any Help much appreciated.

Regards
Ken