So, some more progress. Put together a pre-printed 20 foot ISO container in TNT Freight Services colours. Went together fairly easy, apart from the fact superglue wouldn't stick!! Looks pretty good for the cost, and will be tucked away in a corner of the eventual layout. Although now a global brand, TNT started off in Australia.
Also been doing some more research on grain hopper wagons and railway buildings, more to follow....