Fabulous photo. Cathy's photo of the larva of Psilosticha mactaria at http://lepidoptera.butterflyhouse.com.au/enno/mactaria.html has those same two orange dorsal patches. Could be related or even a different instar.
Yes it is. I'm actually in the process of updating this sighting. I grew an earlier instar up to moth form. It emerged this morning and is indeed Gastrophora henricaria.
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