Wow, thank you all. I looked into the Aluminite casting and it looks pretty doable. I think I would do all the lenses clear and just put colored LEDs inside. I do know a local 300TD owner so I could use his lights to make a mold. Has anyone actually done this with a Benz light?
Another thought is 3D printing. I do have access to one, but I haven't looked for a 3D template yet. Does anyone have experience with 3D printed Mercedes lenses?