zAxis for corexy printer

I build a core-xy printer based on Scribblej's corexy (https://www.thingiverse.com/thing:413394) design. However, I didn't like the way the z axis worked, so I designed my own. Actually, I have nothing agains ScribbleJ's, but I don't have access to a large enough laser cutter to make the bed -- especially since I resized the plans to make a printer with 300mm^3 of build volume.

I am planning to build the heat bed support out of more 2020 extrusion.

This design could be used either for a resin printer as well.

Key features:
-Just 3 parts to print per side, only 2 models.
-The top and bottom pieces are the same - both a NEMA17 motor mount, and a 608 bearing mount for the other end of the rod
-easy to access holes for 2020 extrusion mounting.
-Lots of airspace around the motor, less finishing work to do if your printer isn't too precisely calibrated.
-Makes use of SC8LUU bearing blocks mounted with M4's instead of a press-fit holder for LM8UU/LUU bearings.
-Intended for t