Sorry, I don't know much about the CE side, basically the population of all those cities are growing, with the possible exception of ADelaide.
Sydney - not much manufacturing engineering, nice inner city surrounded by miles of boring and/or dreadful suburbs (the coast is nice, as are the Blue Mountains). Climate is pretty much shirtsleeves all year, a bit humid for my tastes.
Melbourne - the manufacturing powerhouse of Oz. Occasionally drops to freezing, and our summers are a lot hotter and drier than Sydney's. Pretty dull city centre surrounded by some nice suburbs and some awful ones.
Adelaide - very pretty , atmosphere feels lke a small town . Has had a series of state governments run by lunatics who seem incapable of understanding finances. because of this I don't think you'd find much manufacturing work, as they recently have had a couple of bad closures, so there is a lot of spare talent. If you are into mining then you could probably find a gig. A very nice place, with terrific weather, and a laid back attitude.
Perth, nice town, very isolated, not much manufacturing wrk, all the mining work you could ever wish for.
Brisbane you seem to have covered.
You've forgotten Darwin and our national capital, Canberra.
Darwin is generally crazy, I really like it, but there are only two sorts of weather, 90 deg F and 100% humidity, or 90 deg F and torrental rain.
Canberra is cold in winter, hot in summer, and boring all year round. Having said that my aunt thinks it is the nicest place to live in Oz, so there ya go.
Cheers
Greg Locock
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