I visited the Army Museum Bandiana today to measure up and photograph the Blitz and Studebaker Workshop trucks. The very informative and helpful WO2 Ian Pullen was on duty and was able to show me around.
I was able to get lots of measurements and information on the little known parts and toolbox's on the workshop body. Including these bits:

After that I visited Empire Trading & Disposals Company near Wangaratta and got some lovely new bits for my truck, including M113 lights for the taillights, a 1940 pick and a WWII Camouflage net to hide the truck from my wife.
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1942 Chevrolet C60L WO48 - (Workshop)
1944 F15A
1965 Workshop Platform Trailer, Binned ARN: 101-803
1967 Trailer, 1/2 ton AUST No 5 ARN: 154-748
1990 Perentie 6x6 ERV, ARN: 51-981