Summary

Kudos to zx82net for designing and sharing this beautiful box!
I modified it a little bit for my needs to fit in some meshtastic components.

I was asked for the components i was using, so i will document it here:

BOM i used (of course you can build in that lora hardware and battery you have yourself or like to):

1 x WisBlock Meshtastic Starter Kit ( RAK19007 Baseboard + RAK4631 Lora/CPU Module) e.g. (https://de.aliexpress.com/item/1005006901039995.html (Base and Board Mods 1)

1 x M5Stack CardKB Keyboard (https://www.berrybase.de/m5stack-cardkb-mini-keyboard)
1 x CardKB silicone cover from HarukiToreda (https://www.etsy.com/de/listing/1772533422/cardkb-silicone-cover)
1 x 18650 Battery Holder
1 x 2pin JST PH 2.0 Plug for connecting the battery to the RAK Board (https://www.amazon.de/dp/B07NY8CQRV)
1 x 18650 Battery
1 x LoRa Antenna for your frequency band. I chose the straight one without pivot. (https://de.aliexpress.com/item/1005001874225365.html (TX868-JZLW-15 IPEX). This one has the 6mm thread for screwing into the box base directly. no nut needed.
1 x 2.4" OLED Display https://de.aliexpress.com/item/4000002579405.html
1 x Set of 4 Pin JST Plugs + Sockets. I used this for wiring the i2c bus from the Lora Module to the keyboard and oled. I wanted the components to be unpluggable. of course you can solder them directly via 4 cables too.

1 x Mini switch (https://www.amazon.de/dp/B08VDMVY5D)
8 x melt thread inserts (https://www.amazon.de/dp/B0D3DZXT4R)
8x m3 x 6mm screws (https://www.amazon.de/dp/B0DHKMZZ3G)
8 x m3 x 20mm screws (https://www.amazon.de/dp/B0DHKRCSVD)

Printing:

I was printing in PLA. The bottom Part of the box printed with tree supports.