Hello, Am an engineer who is teaching a class in manufacturing. I wanted to use the Ipod and Iphone as an example to describe various manufacturing processes. Can someone help... 1. What's the back bezel of the Iphone 3G made of? Plastic or cold worked stainless steel? 2. How do they inscribe the apple logo at the back? Thanks. More questions to come...Want to be sure before I teach the class. Is there any website for the technically minded w/ this kind of manufacturing information...?