Yeah I remember I tried looking into this and I gave up on it. Iirc I couldn't understand exactly how it worked, and/or it seemed like a large time investment. Not to mention how I manage it in a repository if I can't safely move anything in and out of dom0?
Qubes I think could benefit from more resources for ramp-up documentation.
You can use Salt to automate this work: https://www.qubes-os.org/doc/salt/.