

Reading through some accounts, I don't think the battle damage is over the top, because some of these vehicles endured enormous punishment.

Regards variations in KV features, some of the "small turret" tanks were re-built as many as four times, which means you could pretty much mix up any features you want (I reckon an early KV hull with a pistol port in the hull with a late turret would be interesting).
However, the KV-2s were built in a time before the factories were disrupted and few if any were re-built because most seemed to be destroyed/lost/abandoned on their first contact with the Germans during the chaotic first days of Barbarossa.
That said, there may have been some variation during the transition in model features.
One aspect about Russian armour that always has me befuddled is the almost universal lack of crew stowage ... you'd think the crews would have needed some tarps and jerries of water at least!
Anyway, I'll set the hull down on the base, and give the turret and wash and weather once the lacquer hardens,