That "window" thing is called indexing glass. It is typically seen on high end cars but has started making it's way down the line. It is there to help creat a better seal and prevent extra wind noise. The Corvette's all have this feature and I'm hoping the Camaro will as well. As far as interior room in concerned, from what I've read and been told, it will be quite roomy. I spoke with a gentleman who was a bit overweight and 6'3" and he said that he fit just fine in the Camaro, so you should have no problem.
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