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Fun idea, but it's doubtful either side would have had any M3 series light tanks in service by 1945.
I have a photo in one of my books of a Red Army M3 (with a cupola, same configuration as in this dio) driving near Riga, Latvia in late 1944. Hard to believe but there it is. The road sign is in the photo.
I agree on US M3-series tanks though. The vehicle shown served in Africa in 1942-43 in those markings. However, a quick change to an M5A1 would still work well with the theme.
As you pointed out, two Shermans would work; two jeeps also.
Another minor point is that the Red Army officer is wearing a uniform that was phased out in 1943. It is unlikely, though again not impossible, that anyone would be wearing such a uniform in 1945.
Very cool dioama anyway.