Tank factories in Australia

[Tony Smith]

Chullora Workshops was the factory that produced the Sentinel tanks.
Chullora had just spent several years designing and perfecting the technique of manufacturing cast chassis frames for locomotives, which made their debut on the C38 class. Chullora Workshops were able to use this technology in the manufacture of cast tank hulls, a world first. As important as this sounds, it was borne of the fact that Australia could not obtain suffcient imports of the alloys to make conventional armour plate. To obtain the necessary hull protection, the thickness of ABP-3 (Australian Bulletproof Plate-3, a Nickel-free armour) required casting. The AC 1 was fitted with a 2pdr gun in a cast turret.
I had not heard of the factory ay Villawood (Did know of it's RAAF connection), but the caption for this AWM pic is:
"A prototype Australian AC1 Sentinel Cruiser Tank MkI negotiating a gully during trials at the Villawood test track in Sydney."
There is a book called "Armed and Ready" about the WW2 munitions and supply industries in Australia, with chapters on tank production.