Doh! This would make me so angry if someone did that to me. It looks like a lot of that damage is paint transfer, does any of it come off?
When I first got my Z I parked up the drive at my girlfriends house and needed to move her Mothers car out the way and ended up reversing against my own bloody car in it! Luckily it polished out, it looked a hell of a lot worse than it was, but I was so annoyed with myself at the time.