but nothing seems to work. They have instructions for layman, but that's been deprecated for years now. Anyone know how I'm supposed to fetch the ebuilds up there?
Afaik, there is no zugaina overlay. It is essentially a database for a quick search among overlay. So once you find an ebuild you want, you add the corresponding overlay.
I've used zugaina for hunting down certain ebuilds of software, although most of the time they're outdated so you'll have to do some work yourself... but usually it's faster than writing an ebuild from scratch.
That has been my experience so far.
After I find the ebuild that I'm looking for, I'll place it into my localrepo, edit if needed, create a manifest and then emerge.