I’m surprised nobody has suggested The Bend Motorsports Park in South Australia yet - here is the International Circuit configuration used by the Supercars Championship:
And here is the longer GT Circuit:
Finally, here are the East and West Circuits (shown below as two separate layouts which can be run simultaneously, each of which will need its own set of files):
Given that the International layout has replaced Sandown as the venue of the 500-kilometer endurance race in the Pirtek Enduro Cup from this season onward, it would be a fitting addition to the growing list of custom tracks.