STEP-1: Mixing Plaster of Paris
This is surprisingly simple and very forgiving. Just 2-parts plaster and 1 part cold water, mix well.
STEP-2: Pour Plaster into cavity. 1 pint of plaster with 1 cup of water was just perfect to fill the cavity.
STEP-3 Wait 45 minutes and remove:
Here's where All-purpose sand made a difference. The sand adhered to the plaster and wouldn't wash off. It made the model really, really rocky looking. Which is kinda cool, but not what I had intended:
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