I think everyone is overreacting a bit here personally. You won the car Amy and at the end of the day the repair of the few audio bits ect is going to be less than 1k. If I got a fully functional bumped and repaired Zed for that much I'd be chuffed. Whos to say the next Zed you buy wont develop a coolant problem and quite a few people replace the audio system any way.
The interior can go on ebay (some blind muppet will buy it) and you will probably get more than a stock interior is worth.
I think you should put the worries to the back of your mind and just enjoy it
Oh, and everyone most say they wont mod the Zed at first, though few people stick to it