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Take your model and make a rtv mold of it. once you have your RTV mold, smear some plastic clay like Sculpy inside the cavity of the mold. If you have half of a pouring reservoir in your RTV, complete the other half of the reservoir in clay as well. the plastic clay will simulate the thickness of the material you want to cast. Once your plastic sculpting is done, pour more RTV over the clay to make a "B" side to your "A" side of the RTV... You need to do this to both sides of the first RTV mold.
Once your molds are cured, remove the clay and you will have 2 molds to make 2 halves that you will have to glue together with a serious glue like zapagap.
Make sense?
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