1rst build, time to do next step

[JAZZCNC]

this time I took JAZZ ideas (hope you don't mind JAZZ?),

Nope don't mind at all, only show what I don't mind being plagiarized.!!

Couple of pointers to avoid pit falls which can easily get ya.?

Slot will probably need lifting (or lowering).? Reason being chances are you won't find a timing belt short enough to keep slot in middle and still fit motor in.! The pics don't show it but the slot is offset towards top, the Ball-screw actually mounts above the slot. The ballnut fastens on top side of plate that fastens to backside of Z axis rear plate.

Would use BK/BF not FF/FK blocks mounted straight onto rear of front plate then you can get rid of those plates. Will also make assembly much easier.

With rear covers Instead of 3 flats I'd consider having a nice Arc so single piece of plate bends and follows it's shape instead of 3 separate plates.
On my design I've done it slightly different with the top/bottom rail plates shaped then single 2mm plate bends and follows shape when fastened. This way less work in making the braces and less needed has you don't need any near gantry sides to old the shape.

I'd also beef up the braces just removing enough material so Ballnut passes thru.