Ok, let's see.
Tracks. This thingie is heavy. And at your first photo we see fact of levitation - whole track sections goes up. I suggest to assemble whole tracks aside and install with all suspension as one detail. Such way you can control sag and general shape. Generic rule - if track could go down, it will. And second thing - working tracks could not accumulate such rust, only standing for days can, but other parts does not look as abandoned, may be some dust instead of rust? Same thing for spare sections - such degree of rust is justified for exhaust pipes, where heat, vibration and temperature variation kill materials, but for still hanging tracks?
Chipping goes well, result suit whole picture.
Can't say the same on concrete piles here and there. If those must symbolize dust - then you should blend them in details, not leave spilled around. As side note - remember about layering concept. Nearly nothing could work as-is, all technique must be applied as layer over layer, moving in small steps, even more so in large scales where we can cleary see details with naked eye.
Interior. Good work, like it. May be chipping a bit overdone, but who cares, it looks good. Note on colors: white for turret internals and ammunition stowage; steel grey for bottom, drivers seat and engine compartment; yellow for fuel pipes; green for cooling pipes; brown for oil pipes.
And long-suffering theme - basic protective color - 4BO - should be more olive, try to add few drops of yellow and drab to move tint to right shade.
Looking forward to see your next builds!