Summary

Full props to original design! Love this project.

Modified battery case to remove flanges and accept a 4xAA Battery Holder (like this one from Adafruit.)

The original battery case is brilliant and I'm very impressed. I did use it on my build. But I have no more easy-to-disassemble battery case parts. I do have a bunch of these other 4xAA batt.cases. So I modified it for my own future builds where I aim to hot-glue the case into this box.