I'm in Australia too. I spoke briefly with Customs a few weeks ago and the impression I got from them is that you really need to get your documents right in terms of the correct visa at your destination, especially if you're bringing in a stack of pro-equipment. It's going to look pretty obvious you're not going to spend your holiday lying on a beach sipping Long Island Ice Tea with a little umbrella in your drink. It sounds about right and I suppose Customs would be breaching their duties if they were to tell me otherwise.
The other thing is that you need to complete the form below and register the serial number of every single piece of equipment you bring overseas because if you don't, Customs might decide to charge you GST when you bring it all back into Australia. Even if your gear looks used, there's nothing to stop them from accusing you of buying the gear from overseas and therefore owing the Australian government GST and other duties when you bring them back because your gear is going to look like it's over the $1000 GST import threshold.
http://www.customs.gov.au/webdata/resou ... aggage.pdfI would call Customs and ask them if there's anything else you need to do before leaving on your trip.