Ok, 'ye olde' workshops;
Pioneer Settlement at Swan Hill, have a flat belt drive set up with (from 6 years old memory!) lathes, shaper, a planer (I think) and other nicely done up stuff. They also have a modern workshop where they restore old farm machinery in the collection.
The machinery shed in the Netherby House complex (Fagan Park, Galston, NSW) has a collection of small flat belt drive machines. Special interest is the cutest, littlest planer I have seen.
Closer to you again, is Old Gippstown in Moe. I remember at least 1 flat belt lathe in the blacksmith's shop.
The trick is to look in the dark dusty corners!
ciao,
AndrewOC