I'm sorry I don't accept that it was a standard Chev 1.5 ton 4X4.
I think it may have had a specialist body fitted that has been cut down for civvy use. Have a look at the RAAF pic below of a MCP Chev ambulance/medical vehicle and how it widens out behind the doors.
Pity we have no close up photos of the door openings etc to see if it is more then just a home built job?
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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"