Overall this is an awesome model. The build, painting and weathering all look excellent. It makes this vehicle tempting to buy.
2 things I noticed that might improve on it are
1) the PE bullet belt for the top M42 ... in my opinion these are rubbish. They look too "2D". Some of Dragon figure kits have these belts molded in plastic and would be a much better addition.
2) the stored jerry cans on the front wings are painted the same as the vehicle and weathered/chipped the same. This is very evident in the fourth picture down. Although possibly sprayed along with the vehicle, I think they look much better with an alternative yellow colour, as they will look like stowage, instead of part of the vehicle.
Small nit-picks I know, but they might be worth considering to improve on a very impressive model. Thanks for sharing!