Summary

This is a complete rework of the case providing the inspiration. FreeCAD files are included to help you in modifying the case for your purposes. I tried to make them readable, but I think I wore out myself on that few times.

The case comes in three parts; lower part which is the case itself, upper part that is the cover and a switchblock that is used to hold the power switch in position.

What is needed

Heltec V3 LORA32 kit, battery, a switch and some screws - see below.

The switch doesn't come with the LORA32 kit, but you will probably have to buy 200 of them with about 8€, probably a lifetime supply. 8 x 4 x 3.8 mm three pin two position switch, very generic.

There is just enough space for a 620mAh LiPo battery, 40x20x8.5mm.

The holes in the main block are nominally 2mm in diameter, you can those to lock the switchblock and the cover in place. Naturally as they are printed, they don't come with threads or very specific sizes. I used grub screws, probably 3 or 4mm long, maybe 2 or 2.5mm in diameter. Use whatever works for you, wooden dowels or chicken bones, I don't care.
Do not use screws longer than 4mm, as they are likely to screw into parts you are trying to protect with the case.

I will later fix any problems I run into, but until then, I consider this one to be complete enough. "Perfection is the enemy of completion", or something like that.