Speak to the local council? Each one would be different anyway, as no one seems to be able to standardise anything these days.
From a CASA point of you, you just have to follow the CAAP (or something just as good that would stand up in court) for ALAs, although I'm sure you'd know that sunfish.
You would lose quite a large sector on takeoff because you can't make safe height over the town.
I may not have understood this point but, you don't need to be at 1,000ft over the town if you are on Takeoff and/or Landing. You might though piss off the neighbours constantly doing that (ie; it may be friendlier to accept a downwind and go the other way if your plane allows)