Steps to replicate the system configuration starting from a fresh NixOS installation:

1. install git: sudo nano /etc/nixos/configuration.nix => sudo nixos-rebuild switch
2. clone repository: cd ~ ; git clone https://github.com/siphc/nixos-configuration.git (note that you won't have ssh by this stage!)
3. download source code of required packages (dwm, st, slstatus) and copy configuration files over
4. change users.users.* and "nixos-config=* in nix.nixPath to your own username, of course.
5. nixos-rebuild switch -I nixos-config=/home/[USER]/nixos-configuration/configuration.nix
6. ensure screenshot scripts function properly: cd ~ ; mkdir Pictures && mkdir Pictures/Screenshots
7. fix PATH by symlinking to ./bin from ~/.local/bin
8. reboot.