That would definately be cool.  Couple issues to think about.  The cases are very thin and easy to damage.  If you made some sort of bracing to stiffen each part temprarilly, it would probably be doable.  Getting the case off can be tricky too, especially the lcd casing.  Try testing polishing the bottom first.  If you were to put a clear coat on it after polishing, that would keep it looking blingy!