Hey Gemmy,
I just called AsA head office, they put me through to the public affairs guy in Brisbane who arranged a visit with a training supervisor. Otherwise you could call directly to public affairs (contact details on AsA webpage) and they should be able to sort out a visit to any of the facillites...
It was great, I had a tour of the simulator and sat in listening to a couple of ATCO's for about an hour and a bit this morning. Generally just got a brief overview of everything