The funny thing is, it's not a single piece of metal anymore, they completely ditched the whole "exoskeleton". The Cybertruck is made just like the Model Y, with casted front and back ends attached to an upper frame with body panels. If you look at recent pictures you can see the lines between all the body panels. The panels are stainless steel and probably are a little thicker than a typical body panel so they might be a little more resistant to dents, but that's about it.