I am tinkering on the design, as i find it great. I am wondering if i can build something similar, simplifying it a bit?

Like:
- 2 x 100x100 steel box for the gantry
-The bearing blocks and rails on the gantry to be at the upper side/or at the lower side/ so i can use epoxy and level them easy
-2x ballscrews at the gantry near the rails

What worries me most is the Z, making the z box and adjusting rails and fitting everything in place there. maybe using some ready box section and fit the spindle inside and fix the bearing blocks to the sides of it.