It amazes me the allies had no imagination with their armour design. A rectangular steel box on caterpillar tracks with another semi rounded steel box on top of that. 
Well, for the most part the Germans found a bunch of different sized boxes and placed those on bigger boxes. And the Japanese seemed to like origami for their tanks.
The Allies just went with the "if it ain't broke, don't fix it" route with their mbts. That's where the virtually no change in Sherman looks and the many variants based off of it come it.
With that, the Hi-Power looks even more badass, and I believe we might just be set with the average Sherman for the war. Not much left other than the 76mm gun, 105mm howitzer, and flamethrower variants that would be appropriate in the mod.
