this has been going on in SYD for a while as well. next time check out the big carpark near the tower and rwy 25. i've heard they have a good set up, bbq's etc. the more senior guys get to sleep in the briefing room under the desks which fit a swag perfectly and closer to the showers in T2.
it's amazing, these guys just can't let go of their GA days and good for them.