I've finaly finished the Death of Rats costume
You can see the last 2 pics
http://www.furaffinity.net/view/1166931/
http://www.furaffinity.net/view/1166936/
Or the whole thing can be seen right here
http://www.flickr.com/gp/24926309@N02/p9A9EJ
so... you planning to hire a sculptor to mold plaster over it and make it look like an authentic skull. It's the next logical step
No thast would just make the head even heavier.
I'm suprised how well the little fan I put in it works though. It even keeps my glasses from fogging up