https://discourse.nixos.org/t/how-minimal-can-a-nixos-image-...
https://openwrt.org/supported_devices/432_warning
NixOS works well for x86-64 and aarch64, but not so much armv7l, as so many consumer routers are.
The PC Engines happens to be x86-64 with decent storage expansion, but for sure if you want to target armv7l, NixOS is not a good choice.
The website for the US distributor listed on PCEngines webssite is now selling "BoingFire" products instead of PCEngines.
https://manestate.com
NixOS works well for x86-64 and aarch64, but not so much armv7l, as so many consumer routers are.
The PC Engines happens to be x86-64 with decent storage expansion, but for sure if you want to target armv7l, NixOS is not a good choice.