The RAAF will probably only take up to A045 for extended hours if BN CEN do take over the airspace, and it will be interesting to see how that approach environment meshes with the overlying enroute environment - 3nm sep vs 5nm, vectoring with a radar terrain clearance chart vs vectoring above the grid LSA (which is 6600ft for most of the airspace) etc.
It will also be interesting to see how a VFR overflying C airspace in E at A045 without a clearance is handled in such an enviroment.