I suggest you just create another branch and play around with different file structures and shit. Start with the simplest system possible so you can use `build-vm` to quickly test it.

If you want some inspiration, there's a list of repos at the bottom of my config's README

gitlab.com/emilyyf/nix

It kinda depends on what exactly you want to do with your config. I, for example, was looking for better ways to organize my modules, so I just read a lot of different configs and rewrote my stuff based on what I liked (I did it two times).