I absolutely love the neck!  I made a GIRL/A3 hybrid a while back, like last year or something, but you can never get the neck to fit just perfect, so you have to make sure the head poses so you can't see it (or postwork out any mucked up seams.  Example: http://www.deviantart.com/deviation/25176480/

I'd love a character like this with a functioning neck! :D