In the bottom photo, it looks as if the wheel rim is laying to the right of the tank. Some of the tangle may be the control cables as well, which would be interesting to model. I agree with making it seamless, that's a major goal. There would also most likely be some shrapnel damage to the right side of the trail. Maybe some work with a hobby knife, or Dremel bit, denting and tearing the plastic would be good. I would also guess that if the wheel was torn off, the steering link would also be bent up and maybe even the brace plates (perforated plates top and bottom)?
Looks like fun project! Too bad they detailed the insides of the sponsons, but not the rest of the tank interior.
Ron