Hmmm the photos of the deck you have posted seem to be sitting on a 13 cab and not the 12 cab you originally asked about.
That particular deck is a steel drop side and would probably have been a replacement later in life for the Cab 12. The AWM photo is an all wooden affair and more likely to have been fitted to the 12 cab when it was new.
However both would be suitable for the 12 cab. Below is an AWM photo of this drop side deck on a 13 cab on Lae in the Pacific.
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE" 
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