Mate, try your luck here instead -
The Australian Elises/Exiges Forums | What you'll need to remember in the back of your mind is, because of your age, it is impossible to get insurance coverage even as an owner. I very much doubt anyone will take such a big risk unless you are prepared to offer a fairly large sum of cash.
Year 12 means you're 18 if I'm not wrong. In short, you're under 21. There are no car rental companies anywhere in Australia that will even rent you a "sports car" under 25 let alone 21. The most flashy car you can easily rent is an automatic Audi A4 convertible with a 1.8 turbo from Europcar. However, you bet that they will have the same issue - Nobody will simply insure because the risk factor is just too high.