I've seen comments from people who have done this, only way I could see it sould be done would be to weld the Vickie/Michael head to the P4 neck (or maybe make the joint further down), then cut the joint apart again. This would be fairly easy in 3D Max, I'm unsure about other 3D software. You may be able to use some software I haven't tried (morph manager?) to move all the vickie/milli head dials (which are really morphs) if the head has exactly the same number of vertices after the transplant, another reason for making the joint further down, but Milly (and Michael?) have a double neck, so you are going to have to fix the CR2, in tht case. Anyway, how about the Michael head on the Posette's body, now that would be intresting!