Can anyone educate me on what is meant by "glass roof"? I was under the impression that the glass roof was the area behind the passengers that starts at the trunk and extends to the B-pillar area. I was also under the impression that this was a necessary structural piece and integral to improving rear passenger headroom. So when Tesla says that the glass roof is now optional, is this the part they are talking about? Or is it the additional roof part (forward of the B-pillar up to the windshield)? I'd hate to see them get rid of that amazing piece of glass in the back!