I'm proud of this design not just because it's so small but because despite being so compact every device has the manufacturer specified clearance for cooling while having the most components I've combined yet.

The batteries have their own hand-tied handles so they can both be pulled out with the removal of five bolts. For maintenance reasons everything is secured & located so it can't budge a millimeter but for my sake (not including wiring) everything can be removed by 3 bolts of fewer.

Additionally, this build has no rubber. In an exercise to trim cost & hardware 1/4" ply & half inch plywood are variously affixed to the 80/20 to protect & secure the batteries within the structure. Compared to the rubber, this approach saved pounds, brackets, & dollars. The half inch plywood can be readily marked with a square, drilled with a 5/16ths but, & screwed to 80/20 slide ins or nutted to 1/4" carriage bolts on the structure. Previously I've used this to affix temporary removable surfaces or cut to measure panels but this is the first time I've used it structurally as a retainer.

Lastly, rubber in a battery box encourages the erroneous tendency of building a structure under tension. 80/20 can only handle tension when all the tensioned beams are affixed with the tension fully perpendicular to all mounting surfaces. Make this mistake & your structure is liable to vibrate apart at the slide ins unless you planned ahead.