Z Axis appraisal please

[EddyCurrent]

Latest.
Spec: machine workable area 900x600x150

Plate: 20mm aluminium
Ally profile: 80x40
16mm ball screws (X-1610 Y-1610 Z-1605)
2 off ball screws for X driven by 1 motor via timing belts
15mm HIWIN bearings
'Standard' ball nuts (possible slightly modified by a mm or 2)

I know, a bit of backtracking, but I've been agonising over the L gantry and I just can't get away with that big plate down the back of the Z axis that joins the top and bottom, plus I don't like the ball screw that far back even though I know Jazz said it would not be problem in the real world. This is a C gantry and I'm planning to fit bellows (from here Machine Bellows - Arc Euro Trade) along the front to keep crap out.
You may notice that the Z rails do not meet the front plate, I'll have to mount the rails to the plate and shim the bearing carriages out by about 4mm, it was the only way to get the ball nut in. I still might get a RSW nut for experimenting with.

You might think the Z axis backplate hangs too low below the gantry and that is probably true, I might have to raise the whole assembly a bit but I'd still like Z travel of 150mm

It's probably best to move this to a build log next.