Hi Ben, I'm currently working in the Pilbara and am in the safety business so cover a large geographical area and quite a few big projects, every site I have been on has scaffolders of some sort, either large scale with numerous lifts (modular or tube and clip) or the smaller projects to provide a physical safety barrier. There is a huge amount of work out here with many companies, try Austral, Monodelphus, Lycopodium etc.
I am on site daily interacting with the above mentioned companies and project managers/supervisors and scaffolders are definitely in demand!