[Tony Smith]

This is a picture of a Chevrolet C8, which has had too many modifications to be used as an accurate modelling guide. The headlights are from a civillian Chev truck and there are splash shields under the front body and under the rear of the tray body.
However, much of the original vehicle remains. The two fuel tanks are mounted transversly across the rear of the cab. The rear tray body is a composite steel/ timber construction and you have correctly modelled the position of the toolbox and spare tyre. Also note the door handle on 11/12 cab CMP's is at the leading edge and the hinged end is at the back, commomly known as "Suicide" doors.