The design of the zones will be interesting. If the controller has to be shielded from C airspace and no doubt E airspace as well so that he can concentrate on the circuit traffic so that they do not collide, what happens when the jets arrive, sometimes three arrivals in 5 mins, the C208 floatplanes are coming home to roost, and other VFR aircraft arriving at the same time, plus the odd helicopter, all calling up inbound at around 10 miles inbound. Because its E airspace above and around the zone, there will not be flight plans for the VFR aircraft, Centre would probably be able to help with the jet eta's and any other IFR traffic, but I can see lots of problems at certain times of the day, especially in the middle of the dry. BRM CTAF is currently 30nm and this allows time for the CAGRO to give the traffice information and for the inbound jet crew to assess the traffic. It would be interesting to watch all this work in a zone the size of Hamilton Island.