Sorry have a bit more time on my hands here today. Yes a Class D tower ( I think Mackay is class D??? its been over a year since I've been up there) Can permit you to operate in the airspace with prior approval. The easist way is to give them a call (phone number is in the ersa) and have a chat. If your around the airfield go up and say hello they get pretty bored! and it will give them a face to remeber and make them more likely to let you in the airspace. Pat is the bloke who has the Drifter (fisher actually) really nice guy. I think one of the operaters complained about him flying his "ultralight" into the "operators" airport so he was giving it a break for awhile.