Doing a personal import into Australia of a non classic vehicle is a nightmare and very expensive. Much better to leave it for the official importer to sort it all out.
Nobody seems to have thought it a good idea to have international design rules (at least this has been done for Europe) and the Austalian Design Rules have their little differences which will require expensive engineers certificates.
Click
Importing Vehicles to Australia for the official brochure.
Note that you must have a permit before the vehicle is shipped.