I can drop the center diff out the bottom of my truck and it is a big plus. If you move the motor to the side you will able to get it a lot lower and fit something beside it to help counter balance. My motor still sits a bit across the center line.
Ya the spur gear does hang lower than I like. It was either that or the motor sits higher. I intentionally designed it using a 50T spur gear so I can always use a smaller one. Plan B was to take one of my RPM skids and see if I can heat it up and form it around the spur. (Or just cut a slot and deal with it)
The second concept is going to move the spur gear higher and hang out the side of the chassis so the motor sits lower and off to the side like _DV's layout.
Nice build _dV. I just went through the whole thing. Very clean and solid. I like how you can fit 4s and 6s inside of the tvp's. The slipperential looks a lot smaller than I thought it was.