No, CASA and regulation in general is fairly free here if you know what you are doing. Last weekend I flew from just north of Melbourne to Evans Head. About 600 miles. Didn't need a plan. Through RAAF airspace. One controlled airport enroute. No restrictions at all. On the ultralight side, they are governed by their own federation with very little CASA involvement. As are gliders, skydivers, sports aircraft and hang gliders. It's a very big, uncrowded sky here.