Hmm I dunno, it somehow is missing detail. The shape is too clean and dosnt really look real to me, like a toy maybe. Those pipes and the armored windows, they look like they were manufactored in a real factory and are just dirty now. The "selfmade" thing is not really apparent. Mainly the cage pipes bug me, especially on front.
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You might also want to scoot the turret forward a bit, to get it closer to the center of gravity.