Although you've caught the general idea, I advise you go to WW2 drawings and have a look there. I had some trouble working out which variant you were after, but my guess is the M4A2 which, as Lyan below me pointed out, is slightly smaller than your version. It just needs to be about 4 studs thinner and the front slightly reworked.
July 29, 2011
I don't think Its very good but i know how hard it is to build a tank. it could use some work. The wheels need some and so does the front. It's fat about 2 or 4 studs and needs some hacked for the crew 3/5
Quoting Lego Maniac
At least i put some thought into them. Unlike you. so pfft you and pfft your intelligence. And looks like i need to tell Chris Phipson about this so he can invite you to join the "Time out Corner" Lol.
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requested Pic , Great Job!!!!! i like how you did the treds!!!! keep posting!!!!!