That thing will flip over from the recoil.
Too tall and too narrow for the armaments, really.
Is much less than full on "gun" recoil. Jury is still out I think on whether it'd be too much, but I do admit the design is top heavy.
The problem is space in the hull, 60" leaves the driver sitting normally and able to drive with minimal modification. If I dropped the top of the hull, I'd get a lower center of gravity, but there are tradeoffs for that approach too, probably a lot more work to switch between travel and battle configurations. This one, the bridge drops down to below 13 feet high, and so can go under overpasses, though it is a wide load.