I would dig alot deeper into their red tape on imported cars, contact customs, they are there to help you, remember that there is a reason why these cars are not in Aussie in the first place.
use an import agent or shipping service, they should be able to advise you on the procedures. If you are not using a company that specialises in imports to Australia then you will need to contact Australian customs to ensure you are following the correct procedure. Failure to do so could result in delays of your possessions reaching you at your new residence, or even refusal of entry into the country which could become very costly.
check this link out.
http://www.expatfocus.com/expatriate-australia-customs-duties
hope this helps and good luck.