BlackPrince77,
I'm actually in the exact same position as you, I attempted to set up a visit to a RAAF base recently without much luck. Best thing is to talk to your case manager, they can usually give you a couple of good contacts. Even better would be to head to the Air show at RAAF Williamtown on the 18-19th of September, as far as I know there will be a fair few pilots in attendance on the day who are more than happy to speak to enthusiastic candidates.
Hope that helps
Kyll