Hosting a Beatsaber lobby tomorrow for anyone interested. 8pm CST. 

The mp link in the op is out of date but you can find a working version here:
https://github.com/Zingabopp/BeatSaberMultiplayer/releases
Everything else is still accurate, so update everything with mod assistant and don't forget map extensions. This mp fork works fairly well and seems to have fewer bugs for the most part it really only needs avatars at this point. It seems like the original author is still working on the mod so hopefully it gets merged soon and we can have avatars again.