Heck no! I love a challenge. I had already started to sculpt my own Fett head about a week before I got the Rubies. I've got the the two halves and the left ear done and cast and the right ear is ready to cast. This one I'm going to glass.
As far as the Rubies, I found a good size piece of foam padding that I just shoved right up in there. It is really helping to keep the right shape.
Maybe I'll give it to my son to go along with his Baby Fett get-up! 