Instead of wires hanging through the rear plate I created surface mount holders for the XT-150 connectors:
Xt 150 Mount - Base Red or Black.stl (160.8 KB)
Xt 150 Mount - Black Middle.stl (141.9 KB)
Xt 150 Mount - Red Middle.stl (142.7 KB)
Xt 150 Mount - Black Face.stl (704.4 KB)
Xt 150 Mount - Red Face.stl (690.3 KB)
The black mounts through a 1/2” hole while the red is designed to fit the existing square hole.
Assemble with M3x25 bolts with nuts.