This will eventually end up on a board supporting the GRBL controller box:
It’s a direct cut-n-paste descendant of the old NEMA motor mount.
The nut threads onto the connector behind the bulkhead, so you must either wire it in place or make very sure you can feed all the terminations through the hole:
Given the previous hairball, I think in-situ soldering has a lot to recommend it:
The OpenSCAD source code as a GitHub Gist: