[killjoyken]

You could just mount the MMM to the center diff plate. Check your local hardware store for a 90 degree countersink bit. (metric uses 90, standard uses 82 degree) That way you can make the screws fit flush and have a nice flat centered esc mount and you'll have more room to shift the weight of the battery. If you're hard on your buggy or like big jumps, you may also want to wrap a zip tie around the MMM. I've had the case pop apart on me a few times.