After you partition your hard drive(s) you would have mounted to /mnt, etc… and then modified /mnt/etc/nixos/configuration.nix. You could pastebin this file, save to a usb, whatever works for you.
Thanks for your quick response. After I attempted another installation in order to send my configuration file, I finally realized that I had incorrectly mixed up the uefi and mbr steps. I successfully got Nixos installed with plasma, but am still running into other small difficulties. My goal is to use Nixos for dump1090, gqrx, and cubicsdr for software designed radio programs.