This is cool, but Flipper Zero is in my opinion, cooler.
https://www.hardkernel.com/shop/odroid-go-advance-black-edit...
and it does come with a more digestible price tag
I really like their blog on how the moulds etc. were made too.
Also iirc the firmware is now open.
If you do a couple of prototypes it's fine. If you want to make a thousand or two, you are in a world of pain.