I used Bondo (a thick type of polyester resin used for auto body filling) to smooth and refine the surface. The model for the phone base itself was built up out of a few layers of MDF and plywood. With plastic as thin as I was using, it was really easy to burn holes through the plastic if I heated up a spot for just a split second too long.
I found if the plastic does not pull as tightly over some parts as you would like (either because the plastic was not heated enough in that spot, or because the vacuum is not strong enough), you can heat it up some more with the heat gun as the vacuum is still running. Make sure to bring the frame straight down rather than from the side, or you may stretch parts of the plastic and cause it to tear.
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