If you can get a wing and door already painted it might not be too bad. Otherwise it is going to be pricey!
Whoever did this knows but they have fled to save their own insurance (if they had any). This makes me furious. Where did this happen mate? At the end of the summer, I am buying a banger for day to day driving to avoid the z getting damaged - don't trust leaving it anywhere now. Its sad that anyone should have to feel that the have to do this but its reality...