Quite nice. I'm going to make a small suggestion, because I know you are a gifted builder who can make use of it: the bow might want to be a small distance further back from the front of the treads, not much. This would be a subtle change that most viewers will not notice. But it's not just visual matching to the real thing. Consider the all terrain properties as the tank approaches a somewhat tall obstacle.
Nice to see the lesser known gun platforms like the Stugs.
There is a World War Two group on this LEGO® community site:
http://brickcollections.com/pg/groups/2453/world-war-two/
and we would be delighted to have you join. Other members would be interested in your MOCs.
Stephen