Found the code for a very basic raid frame I used for some testing in the past.
https://gist.github.com/Lombra/782d84064be0d1f3eefc
This seems to be able to create frames when I join a raid, and also add new frames as more people join. I don't know what prevents other addons from functioning.
Edit: Pro tip, go hit a training dummy in garrison and then join some fast filling raid like Kazzak or one of the major Tanaan rare bosses!