Flat panel is what trucks have needed to go back to. Get a bad dent or the garbage is rusting out? Cut it out and weld some sheet on top. No need buy an entire door or go to a body shop.
Not immediately but if this thing is as indestructible as it looks, after 10 years of hard use, new battery pack, it's not hard to imagine that it'll be fixed by welding steel panels on it.