Hey dude,
Sorry to hear about your car. Well I would help but I am in Sydney and would love to give you a helping hand. IN my opinion the cheapest way to fix your car is to find some people on the forums here and get all the parts needed to fix your car like all the panels which I have seen you already got. Im sure you could get your car fixed under 3000 if you knew the right people. There are heaps of people who own sprinters in adelaide who could give you a lending hand.
Sorry I couldnt be of any decent help
Good luck with it