Odd about the github setup issue. Guess I don't quite understand. Seems like someone could just email nex3 or someone at github to get the correct config incantations...
Also, it's confusing that the Description of the project at github doesn't say "The community's extended version of Paul Graham's Brand New Lisp". Currently, it looks like that's where pg keeps the source.
I'm sort of around-ish. I don't really do anything with Arc anymore, but I occasionally browse the forums (e.g. now). I'll certainly reply to any direct questions.