Looks neat!!!

But for Bitcoin? I use this. Based on a Raspberry Pi, a whole lot cheaper and better than a Ledger.

https://seedsigner.com/

Full tutorial here:

https://youtu.be/AZqlIkJf0mA

This guy sells a self-assembly kit ready in 5 mins, with WiFi physically disabled. Just bring your own power supply and SD card.

https://t.me/seedsigner