it ticks the boxes apart from transport/congestion Louis.
try getting around there at rush hour, it would more than likely be worse than that with a stadium on there.
i dont know a suitable location myself thou.
this is a very open question, so please dont shoot me down too badly, but would belefield not have been big enough even to be considered?
i know planning would be a no no anyway.
an looking at the suncorp, that does look fantastic from the inside, looks so big yet its only 50odd, must be roomy