The inside PCB must be ordered in 1.2mm thickness. Surface finish must be ENIG at minimum.
The outside PCB must be ordered in 2.0mm thickness.
I recommened https://jlcpcb.com for PCB production.
Special thanks to:
- citrus3000psi for the original project
- MockyLock for the idea
- Extrems & emu_kidid for doing the real work needed to make this possible