Welcome aboard Mick. There are a few Aussies on the forum so that will be a help to you sourcing things down under. From what has shown up on these pages there is alot of talent under the Southern Cross.
You don't say if your in a club but if not I'd suggest you check one out. Model boating is always more fun with friends. The club I belong to has a club listings page at:
There are a half dozen listing for clubs in Australia. Hubertus Model Boat Club is near Sydney. Even if that is too far for being a regular member it would be a great source for information and the occasional event.