The toughness of a pickup truck has been watered down and Musk is trying to build a vehicle that can stand to the definition of tough. That's what I gleam from his talks and publicly available information. For instance - the bulletproof exterior, now I don't know why anyone would want a bullet proof exterior when your windows are not bulletproof. Then I think may be it is to stop some accidental bullets when you are out on a hunting expedition. Just taking a wild ass guess here.

Other than the toughness, I can't find a single reason why he would go with stainless steel.

Sitting here in India and contemplating about the CT, I would buy this vehicle in a heartbeat. It is so menacing, that it would give me peace of mind while driving on Indian roads. The vehicle by itself is an insurance against road rage :).