It looks exactly right but I have a bit of a problem with the size. I know that my recollection of sizes can be way off and I often worry that my mind plays tricks on me with respect to moth size but I really believe that this moth was significantly larger than 2cm wing span. Glenn should have this one so he can confirm.
Guest's specimen from near Adelaide was listed with a wingspan of 1 inch (2.54 cms.). Hewish's specimens from Victoria were listed with wingspans of 2.2 and 2.3 cms. It is reasonable that specimens from further north (ACT) be larger.