M/H Ford 3a FAT (Aust) question

[cliff]

I have been collecting information and measurements on the Australian 1941 Ford Marmon-Herrington gun tractor with the ultimate aim to do a 1/35 scale model of one.

Now apart from the M/H conversion to the chassis I believe that the front Mudguards, bonnet, grill and firewall/cowl/windscreen frame are the same as the standard 1941 truck and the only difference was in the doors and back of cab area.

Is this correct?

Can anyone tell me if the doors are the same width as the standard doors and the cab from the door hinge pillar to the back of cab are the same as a standard cab.

Or even better is there someone out there that maybe has one can give me some basic measurements of both the cab and the rear body?

Thanks in advance

Cheers
Cliff

Photo is courtesy of AWM and shows the model I want information on.