I was thinking a string along whatever major route goes through the middle. Maybe I'm wrong, but the way I see SC infrastructure is that you have chargers every 150 miles along the main route, and that gives you about 2 hours of range north or south of that route to get people to their destination.I would argue that they do indeed need superchargers in the Australian interior. The difference between that and not having supercharges in North Dakota is that in the US you can divert 100 miles or so south and still have a well populated transcontinental supply of superchargers. In Australia they do not. They simply can not get from one side of their country to the other. An interior route North-South and East-West I think would be critical to illustrating to the general public the viability of Tesla and its superchargers.
That all being said, I do not live there so perhaps I am putting words in their mouths. If that is the case, by all means, please correct me.