I have recently stumbled over a source of topo maps covering eastern Victoria and the Grampians that y'all may find useful.
http://www.dpi.vic.gov.au/game-hunting/game/deer/sambar-hunting-with-dogs/deer-hunting-locations/deer-hunting-in-eastern-victoria
http://www.dpi.vic.gov.au/game-hunting/game/deer/sambar-hunting-with-dogs/deer-hunting-locations/deer-hunting-in-grampians-area
Looks like they are 1:100,000. They are colour coded for deer hunters, and with a countour interval of 100 metres, probably not the sort of thing you would want to use for off-trail navigation. But they are awesome for trip planning.
Between National Parks, State Parks, State Forests, etc it is often difficult to see the accessibility of land. (I have yet to find a comprehensive listing of State Forests). But these topo maps show you just how much public land there is, especially in eastern Victoria.
Mad