Aluminum can be a good thing. The only thing bad about aluminum is that it is a very temperamental metal to work with. Very quick melting temperatures (doesn't cherry-up like steel or iron). Need special bonders and welding material for aluminum. but I think the auto industry in general is ready for it. The luxury marques (most notably Audi) have been very aluminum intensive in construction as of late. heck, the latest step for them is to move on to using carbon fiber.