Gerald,
Have a look at this Yahoo group:
http://groups.yahoo.com/group/oz-modeS/
Is that what you are after?
It was formed so that Australian SBS owners could exchange information, tips and help so as to get the most out of our investment. There is also a file section which has a few outline files for Aust airports plus coastal outlines.
Also on the Kinetic (UK) website:
http://www.kinetic-avionics.co.uk/downloadssbs1.php
the SBS Resources file 3.1.5.0 (12 Jan 09) has some hi res outlines of Brisbane, Sydney, Melbourne and Adelaide airports which are excellent for close in work.
A number of the Aust SBS owners also feed PlanePlotter which makes the comings and goings in our neck of the woods that much more enjoyable.