folks,
take your time to do this.
i was lucky to find the a-pillar that i believe it is for auto-dimming rearview mirror. since i am not planning to get one (auto-dimming), so it is perfect for this project.
my original thought is to wire a 12V DC extension from map light assembly to sunglass holder. by doing so, you will get one additional 12V DC output underneath roof for nav, radar detector, or anything you can think of.
i am happy with what i have now.
i will take another picture when it is warmer.
good luck, folks, on your project.