Wonderful work, I'm going to copy a lot of your solutions. The flipped gun especially, since I did not think there was enough room for it.
I am waiting for the custom 3700 mAh battery pack I found on ebay (similar to your solution) as well as the metal parts for suspensions and gearboxes (which I mean to keep in their original form).
Also liked the rear hatch. I want to use the driver hatch too, but that is also a good place to use, maybe for the charger plug.