This is a very simple case for the Heltec 32 V3 LoRa board but that also has a compartment for a battery and gps add-on as well.

I do not claim much expertise in this area, but there wasn't anything exactly like I wanted, which is why I designed my own.

The idea for this case very much came from IKB3D, so shout-out to them for a good-looking case. (https://ikb3d.co.uk/collections/meshtastic)
However, other than the idea of making a case like this, I designed all of the components and performed all of the measuring from scratch in Fusion360.

This is the very first and very early iteration. I am uploading this design after assembling the case and testing it out.

For those wondering, it took 6 different test prints over a month of spare time to test out and refine the different measurements.

Assembly will require soldering experience. As the photos above show, mine is very poor. Hopefully many of you can do a much better job.

The gps receive jumper cutout is specifically for GPIO46.
Connect this GPIO46 jumper to Tx on the gps board. Do not connect Rx.

Use GPIO46 as the position receive option in the meshtastic app.

The double-jumper cutout is under pins 1 and 2 for ground and 3.3v.

Connect this ground to the ground pin on the gps board. Connect this 3.3v to pin 1 on the on-on-on switch.

NOTE: Repeating the note/suggestion from Meshtastic here that you should use a USB-A to USB-C cable when charging this device while a battery is connected.

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Parts: (All links are non-affiliate links – these are simply what I purchased, but feel free to find your own)

Heltec LoRa 32 V3
https://heltec.org/project/wifi-lora-32-v3/

(Flash with meshtastic: HELTEC® LoRa 32 | Meshtastic)

GPS Board, GT-U7 (NEO-6M compatible): https://a.co/d/1DOf32r

IPEX to SMA connector: https://a.co/d/7FGnhBD

Antenna: https://a.co/d/7IyTsX4

Battery Connector Cable: https://a.co/d/iIhkR6t

Battery Holder: https://a.co/d/eX8V8Rz

Battery: https://a.co/d/2mSQ8gR

On-On-On switch: (these are challenging to find)
https://www.newark.com/alcoswitch-te-connectivity/a211shzq04/toggle-switch-dpdt-5a-125vac-panel/dp/99X0378

https://www.farnell.com/cad/2291354.pdf

Note that I have a lot of existing breadboard jumpers around that I used to connect the components.

But here is a link to assorted types. I haven't used these, but these are similar to what I used:
https://a.co/d/eB1VfqM

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General assembly instructions. (Still requires some skill and attention.)

- Fit the square gps antenna cutout in the middle recessed square on the top plate. I used hot glue to hold in place.

- Install the IPEX to SMA adapter in the keyed side hole. I used only the friction washer and nut on mine.
- Install the on-on-on switch in the top plate, following the keyed diagram below (pins 1 and 4 should be towards the outer wall)

- Using breadboard jumpers as well as soldering, connect the components following the chart shown below. Use the middle hole provided to route wires before sliding the battery holder into place. Generally, connections to the switch and gps board need soldering. I also soldered the battery negative lead to the heltec connector jumper negative lead as well. Use your own preferred mechanisms.

- Carefully insert the heltec board into the body after all of the connections are made AND the battery jumper is connected to the bottom. Take care to ensure that the double and single jumper connecting pins 1, 2, and 5 do not slide down and create good contact with the board.

- Connect the IPEX to SMA adapter to the heltec board, carefully looping the wire under the board while ensuring no hard kinks in the cable

- With the switch in the “off” position (toggled towards pins 1 and 4), insert the battery holder into the lower cavity of the case. Note the cutouts in the holder need to be towards the outer wall matching the alignment bits in the cavity. This is also a good time to neatly coil any extra cable under the battery holder as well, however note that jumpers to the gps board will most likely need to go over the battery, so leave enough slack for them.

- Insert the battery into the battery holder. Make sure to match / align the positive markings on the battery with positive markings in the battery holder.

- Feed the GPS IPEX connector through the small hole into the gps cavity and connect the gps antenna to the gps board. Slowly feed the gps antenna and gps board into the gps board cavity.

- Arrange and clean up all jumpers and cables in the lower cavity and install lower lid noting there is only one possible orientation.

- Coil the extra gps antenna cable carefully in the upper cavity, push any extra cables / jumpers back into the larger hole and very slowly / carefully snap the top lid in place (which had the gps antenna glued and on-on-on switch alread installed early in these instructions)

- Twist on external antenna