Here are some pieces that I recently did for a guy’s car. They are actually not overlay’s but thin covers that I molded slightly larger than the original part. That way I did not have to worry about the attaching points.
Nice job, I do the same thing. I start off by sheet waxing the part to the thickness of the laminate plus the thickness of the tape. The mold is made from that surface and then the parts coming out of that mold are good to go directly over the existing cover.