svdl, that is very lucid. In your second option, is there anything to know about how the groups should be named? I have read in RTFMing something about groups being named after bones. I would not mind attaching the M3 genitals to M3RR. It seems that what you describe would work, maybe even still permitting morphs of the original hip. I also have to see if the process you describe would permit making clothed figures from a figure and its conforming clothes. My attempt making clothing body parts into props and then using "replace body part with prop" on the figure did not work... the joins were bad. Anway, thanks for the cool info :)