Quote - A question, wouldn't it be easier to use a dummy character. In this case for example 1 polygon hidden in the head. This character could conform to the head and the parented props goes straight in place.

Well I guess you could do it that way, and I don't think you would need 1 polygon, just use a blank geometry statement for the head. Problem is the attachment (tube) should move with the mask (base), not the head, though perhaps it does not matter much in this case. Also you have added another file to load, now you need to load the conforming figure, then the mask, then the smart-prop. Where as before you only needed to load the mask pp2 (which contains the ghost) and the smart-prop.

You are correct in pointing out that my method adds an extra prop that requires deleting if the base (mask) is deleted, but this seems no big deal to me. Your method requires loading an extra item mine may require deleting an extra item (if you decide you don't want the mask in the scene any longer).

If you were going to go down the route of making a conforming figure, I guess you might as well make the mask a conforming figure (or a conforming figure with the mask included in it as a prop), with a ghost actor to smartparent the props to. This is not a bad idea, but reading the first post it seems that TrekkieGrrrl would rather implement this as a prop, quote: "Should I make the Base a conforming item? I'd rather not...".