I know this thing is meant to be hitting production later this year, but I still don't see how they've sorted crash testing, pedestrian safety etc. etc. There's a reason cars aren't made in stainless steel (cus it's really difficult to fabricate and heavy af - and EVs do not need to be heavier. Good luck getting it repaired if you crash it too). Given Rivian and Ford can't make enough EV trucks to keep up with demand, I know what pony I'd bet on.
I can't see that crash testing being any difficult than any other vehicle, not sure about the pedestrian safety but I'm sure it's factored into the design.
Stainless steel is only more difficult to fabricate if you use the current process of stamping all the panels with complex compound curves like most cars are today. If you use straight bends and flat panels it's not all that difficult to work with. Tesla's own version of 301 stainless steel is not necessarily heavier than steel that is used in conventional body panels and we haven't seen, what the actual structure is made from either, it could be aluminium mega castings. The use this stainless steel on the Space X rockets where weight is a premium.
When it comes to repairing the panels, you'll find that no body shop actually repairs panels (as in panelbeating) on any modern car. They just install a new panel and match the paint.