Amazing !
I’ve also been working on one. I had to suspend it in the middle of its progress but I made it available in CC0 anyway.
I went for reproducing a real one from scans rather than producing an anatomical “average” and clean version because I want it to be usable for films rather than educational content.
So I think our projects kind of complete each other 
Have a look and feel free to discuss on it : Accurate human skull (available on Blendswap)
Keep up this very skull work ! 