Sullivan Dynatron Starter with Battery Box

I designed end caps for Sullivan Dynatron starter and afterwards I added battery box to the bottom of the starter. You can find my "original" end caps design here: https://www.thingiverse.com/thing:4356339

I modified only the back end cap, so all the other parts are the same as the "original" design.
For back end cap, I moved wires output hole so wires goes directly to the battery box.

Battery box is mounted to end caps for using 4pcs M4x10 countersunk screws.
On the bottom of battery box are holes for allen key so you can quite easily mount battery box. After tightening the screws, I added rubber feets over the holes.

Battery box inner dimensions (with cover on):
Width: 75mm
Height: 30mm
Depth: 155mm

Battery box cover slides on its place and I rubbed a candle on the sliding surfaces to reduce friction.
4pcs ø5x2mm magnets ensures that the cover stays in place.