As far as the multi color camo goes here is my two cents: First off, this is "what if?" build, so anything goes; second, multi color schemes did not really starts appearing on Soviet Armor (at least what was visible to us in the West) until late in the Cold War. Most noticeably in Afghanistan in the early 80s and later with forward deployed units in Eastern Europe arrayed against NATO in the few years prior to the collapse of the Communists. That scheme is typical of stuff seen from about 1986 onwards as camo began to appear regularly. I suspect that Kubinka painted that scheme on the tank strictly for effect in the museum. Prior to the Soviet/Afghan war, while Soviet AFVs did occasionally sport camo schemes they were temporary types, being either mud or whitewash applied in the field and removed when coming out of the field. Otherwise, Soviet armor was uniformly green. For the invasions of Czechoslovakia in 1968 and Hungary in 1956, prominent white air recognition markings were applied, as were white sub unit markings aside from turret numbers. Have a look at photos from those incidents to see what I am referring to. Had a WWIII occurred with Soviet armor leading the way, most likely, similar markings would have been applied.
Anyways, I am looking forward to what's next here!