[sambo]

Well I spoke to the agent and aside from giving me news of delayed flights, apparently the process is as follows. They will call when they receive the goods from Qatar Air, I drive to their depot in Tullamarine to pickup papers, then I drive over to customs with those papers and pay duties, GST and other admin (bend over) fees. Drive back to the agent with stamped papers, possibly pay another small fee to release goods (they won't know until the day) and finally it will be loaded onto my trailer.

I'll update this thread after the deal is done. Hopefully it will serve as useful information for the next person!