+1 on the sunroof delete. I have other cars with sunroofs and never open them. While, it is true that I will not gain an additional 0.1 second on the track because of the weight loss, I couldn't pass up the chance to delete it. This is from someone who had to fabricate steel panels to fill the sunroof hole on my last two race cars.
OP, nice writeup. If you are doing your HPDEs with NASA Mid Atlantic this season, come find me in the paddock. Just look for a black/green Spec Miata (can't track two cars at the moment, so the M235i stays home while the son is on track
).