I first heard it mentioned on Radio National as Tim Fisher's big idea. What wass presented was Australia's version of a Mt Rushmore-style rock carving as a memorial to Sir John Monash, one of Australia's more successful generals from World War One.
The former deputy prime minister has even selected a possible site for the gigantic rock carving - just below the snow line in Victoria's High Country.

Leunig has somE fun!
I think that we can let that big idea float bye don't you. There must be other ways of honouring Monash.