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Regarding the bore size of 120mm, IIRC it was determined years ago that this is the largest practical round size that a human loader can realistically handle and still maintain an acceptable rate of fire. Since the Russ has a human loader not an autoloader it makes sense. It just looks bad because GW weapons are heroic scale. A properly scaled 120mm barrel, even with a thermal sleeve or in the case of the Russ a water-jacket, would be about the diameter of a pencil. It would probably be more about the size of the GW autocannon.

But the most egregious problem for me is the complete lack of suspension. I would not like to ride in one over anything but a nice paved road.