Rain v2 Rig is boggling my mind

I downloaded the Rain V2 model from here, watched the demo video. Impressive what can be done with the rig.

Playing with it there seems like a ton of things on this for who knows what spread throughout almost all the layers available plus a ton of custom scripts that can’t be gotten rid of short of exporting the meshes as obj. Has anyone been able to makes heads or tails of all the stuff in there or know of some place that has more info of the tons of stuff in there?