Here’s a link to an iso for testing: nixos-22.05.git.4b46a593ef0M-x86_64-linux.iso
sha256: 876c96c32e0156ef7c5391567a715744de7cfbca66a9141ed1ff1ad5b2e69e23
The iso was built against this file on my nixpkgs fork: installation-cd-graphical-calamares-gnome.nix
And as for when to publish, I think that this could be used without other tools for the time being, and I think could be helpful for some people. But my only concern would be users installing NixOS possibly without even reading the manual, and then being lost on what to do.