Will both the driver and the gunner fit? It seems even more cramped than an early WWII vehicle like the Pzkpfw I, providing literally no room for two people. Granted, this is an issue with the original design rather than your implementation of it, but asking one person to drive, aim, fire and load the main gun and the secondary gun does seem to be excessive...
The hatch is much too thick - that much solid steel would be impossible for one man to open. Consider something like a WWII-era submarine hatch, where the inside of the hatch is also curved. The locking mechanism also provides some visual interest.
The rear storage boxes are wider than in the concept. In the concept, they can be fully opened without hitting the fuel tank. The two thick straps over the boxes don't appear in the concept, and would prevent them from opening at all.
The tires need more polygons - 24 or 32 sides would be reasonable given how large they are. The tread in the concept is much simpler - just chamfered rectangles, as opposed to the extruded ellipses in your version.
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The hatch is much too thick - that much solid steel would be impossible for one man to open. Consider something like a WWII-era submarine hatch, where the inside of the hatch is also curved. The locking mechanism also provides some visual interest.
The rear storage boxes are wider than in the concept. In the concept, they can be fully opened without hitting the fuel tank. The two thick straps over the boxes don't appear in the concept, and would prevent them from opening at all.
The tires need more polygons - 24 or 32 sides would be reasonable given how large they are. The tread in the concept is much simpler - just chamfered rectangles, as opposed to the extruded ellipses in your version.