Ted,
Bob's method is one way of doing it. If you have trouble with sticking, let the casting really set up solid in the mold. Then peel carefully. You can either apply them semi-soft, as Bob does, or hot glue them in place when they are dry. Usually, I just spray some "wet water" in the mold before pouring the plaster.
I think you'll find the P of P easier to work with in molds than the drywall compound. It can be done with compound, but setting time is long and the castings aren't as tough.
Usually, it's P of P or Hydrocal for castings and the slow setting stuff for the basic scenery shell.
Jim
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