I believe what you're saying is that the unibody case on the side of the MacBook Air is dented. I don't really know what you're talking about when you say "pan." I've never heard that before.
Unfortunately, if your MacBook Air is one of the latest (2011) models, and you want to replace the unibody case, it's not possible. The parts aren't available (yet), and even if they did become available, it would probably be within a few more years. Plus the case would be enormously expensive.
I just don't see a way around this. You should have your brother buy you a new MBA. Sorry! :|
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