thx for the replies everyone,
Sprocket Check, i've been researching airparks and whether one would be feasible - i have looked at most of those mentioned here. Cooranbong is down and out so not many opportunities left within 1hr of Sydney. Bankstown land is too expensive so won't happen there. Rylstone is nice spot but in the stix; good weekender though. They all seem to only have 30% take up and there locations seem to be the main problem. If something 1hr from Sydney had land for <$500K it might be viable.