Not many in perth will fit body lift to air bag car because there piss weak and scared of legal ramifications, and if they did it would cost a fortune.
It is easy enough to fit yourself anyway,more than enough info on this forum.
I even made my own kit.
As far as getting it engineered, you certainly can in perth,will cost at least a grand just for engineering and lane change test etc and then you take it over pits. Speak to Rod Mcconkey of Rocket engineering, Ive never met the guy but from the one phone call I made a long time ago, he told me what I wanted to hear.