Models are always fun to look at and I would guess that this is a copy of an actual vehicle. But, the question I have from looking at this is why would the German's had felt a need to retain the hull and rear turret mounted machine guns, which are quite redundant for an artillery support vehicle, with the spare ammunition tubes being carried on the rear of the vehicle. Surely, if there was a chance that it might get caught in the middle of an infantry ambush, where having the vehicle swamped by enemy combatants, they would have not carried such supplies on the vehicle exterior. Also, if you look at my previous pick (as I just noticed) you can see the same rack of tubes on the vehicle rear.

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