E revo direct drive out runner

Im toying around the the idea

I am starting to piece together a e revo, and was looking at all the parts of the transmission. And was like wow, this thing needs a center diff, or direct drive


Ideas? I know someone here did it. What size Axi motor would I use? Is it worth trying, or its it on the lower side for power for a big truck? And would the MMM esc work fine with the motor? What kind of voltage do you run with a outrunner? 5, or 6s good?

Sorry for all the questions.