Hmm, apparantly I can't go back and edit some of my older things, only what I've posted recently, so here's the missing pics and the info on prepping the Lindberg skull.
First, the eyes and nose were hollow, and needed to be filled. I was also worried about the nose bone being too thin, so we made one out of clay and covered it in the same glue we used to glue the top on, then sanded down as much as possible.
On the underneath there were lots of little holes. We plugged all those in and filled in the holes behind the eye socket.