So once you have the tools, you need the data. A search for 'NVIS' inside .gov.au should turn up vegetation data for the whole country and each state, so download that for the state you are interested in. The other data are landuse data, each state seems to manage their own data and fortunately they all use the same ALUM system. I keep meaning to note down download links but forget. You will also need shapefiles for each state, these are used to work out which state(s) a particular tile covers. You know about getting OSM data. And don't forget apt.dat (for the airports) from fgdata and height data from
Viewfinderpanoramas.org. Keep a note of any difficulties you have and we can improve the docs and/or tools. To avoid clogging up this forum topic you could raise particular issues in the
australian_scenery repository.
Then you need to create a config file to drive the construction. There is an example file called
config_nsw.ini in the "recipes" directory of the repository which you can adjust to your needs, hopefully it is reasonably well documented. If you can fill in all the values that the config file wants you probably have all the data you need.
So I have tested that the tools work for WA, QLD and NSW. If you feel like having a go with Tasmania, that would be fun as it is an island and if you get it all working and manage to generate the whole place I reckon we could try getting that into terrasync as a test case for all of Australia. Otherwise getting things working for SA, VIC or NT would also save us time - the only likely problem is that states have subtly different ways of coding ALUM codes.