I would make a mock up of the headlight assembly first.
Dissassemble the headlights and make a wooden mold of the basic shape of the headlights, then mold the features using silicone. This is a prototyping technique that is used where I work. It yields great results in smaller jobs where few parts are shot. I think the hard part in making this would be to get the reflector pattern correct. But good luck, I hope I was of some help.
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