Now thats the most out of the box z design i have seen recently. No shame in using 8x Hiwin bearing blocks and 4x rails plus a couple of motors apart from the Hf spindle. How would you align all that stuff in place? Each piece must be carefully machined to a tight tolerance.

Ok. I know that you will patiently make it. Obviously not your first machine 2 questions:

1. Wasn't it simpler and better using BT30 spindle and servo motor on a fixed gantry?

2. So much effort in all places but gantry will slide on round open cage bearings? No square supported ones?