hi my friend what a great build i mount my battery in the same place as you but i use lipo packs which are a bit thinner i hope this helps
i am still looking for an alternative place for mine so if i find anything will let you know buddy
I actually have moved my battery to the rear where the plastic box was. I placed the receiver and ESC on the plate in the center of the chassis.
Clears the interior just fine, but I do think it's bad that I have to take the body off (Which is hard to put on) to change batteries...