I built my router and NAS from NixOS. It was a mostly pleasant experience. Being able to sit in an IDE on my laptop, and build up a server, incrementally pushing changes to it, with rollback if necessary, was great, and I wouldn't want to go back to anything else.
I wrote about the router here. It's pretty heavy on router stuff, and my own thoughts though...
I wrote about the router here. It's pretty heavy on router stuff, and my own thoughts though...
https://www.jjpdev.com/posts/home-router-nixos/