My dolls are my models was the first to hybrid Novi stars and MH, I totally swiped the idea. Here's my gal :)
For anyone wanting to make their own hybrid- you WILL need to clip the neck hook that goes inside the head, leaving on the little round, flat base at the bottom so the neck post will work with the head. You'll also need to carve a bit of vinyl from inside the novi star head. I tried to just warm the vinyl and push the head gently, and it wasn't going without damage, so carving was the only option for me.