So, the problem is....How to make a model to fix this thing? Right?
Forget what it is....just fix it, huh?
But, you need to make a working model? Strip the Porcelain and rebuild it and glaze it, no?
Need to have interprox the same and occlusion the same? I can think of a few ways to record that info based on the existing shape.
Did Doc not make any attempt at some sort of impression of the Implant position for ya?