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I thought that the roof needs to be removed to replace the rails. Regardless, I am fairly certain that the glass is different if you have rails vs. not.
A few folks have gotten stone chips on the roof as reported on here. I imagine it is far from common. A roof repair is very expensive. 3k for the glass plus labor if it were to require replacement.
Enter the location of a charger far away from you tomorrow on your drive to work. Assuming you work 30+ minutes away, you should see your battery temp climb. If it does, your heater is working. If it doesn't, it is suspect.
Sorry to bring this back, is it normal now to see a battery drain in consistent temperatures? I just got the ana6 update and my battery drain is now a consistent 1percent every 2 - 3 days. Before the update, I could leave it for a week+ without any drain.