Saw this source:
http://www.solarfilmco.com/mirror.htm
Surprisingly, I have seen no Airstreams with mirror windows. It seems like such a natural, what with the polished aluminum look and all. I am going for the same look on my '60 Safari. All windows were not broken out, but were poorly replaced with crummy plexi-glass (or acrylic?). Good luck on bringing about a rolling wet-bar.
Stop by for a drink!
(D)