with a sliding door to the rear it seems to me your CMP is not very original. Is the cab an early cab 11 or 12 or the later cab 13?
For example...headlights in the body or sitting on top of the front guards? Is the radiator accessable from the exterior without opening a bonnet (Hood)?
With the other mods you say it has it may also have had the front axle replaced with another to make it only 2 wheel drive.
some pics would certainly help a lot.
Cheers
Cliff