I can't see how the 3 heads would cause trouble, except that we would have to do some of the work 3 times. Let its chest or abdomen be the root segment. But as a Poser geometry file it would be best if all the heads and necks were stretched out straight forwards along the ground. Also, each head and neck could be an IK-chain. Do you want the back frills to be posable? How big is its geometry file? If it is bigger than a few dozen kilobytes it might be better to put it on a temporary WWW address and tell us where to download it from.