First, I am glad that finally a meta-package had arrived as a ppa. Now, you, Dale, Trevino, Will and others can get together there to discuss matters. I like the idea of github too.
Maybe this link should also be shown here, https://code.launchpad.net/~unity7maintainers/+archive/ubuntu/unity7-desktop as it is usually hard to find where the ppa is in Launchpad. Maybe, the heading should changed from "Unity 7 Testing “Ubuntu-Unity-18.04” or "“Ubuntu-Unity-18.04-Testing” so it would clearly tell people,what they are getting. Also, when you are making the wiki, don’t put in the standard line “this unstable ppa…” People, who try it would be those, who are not afraid to try.