SKID PLATE!!!
The Rear Skid Plate turned out to be a Great way to mount the Engine and the BiG Rear Tires. I started by making a "T" shaped piece of plastic to fill the depressed area in the rear. Then I glued it in place.
I added 2 strips of half-round strip plastic on the Skid Plate and glued in in it's new location!
I made a small piece of plastic to fit on the front of the Skid Plate to make it smoother...
Here it is in place. Both the Engine and Big Rear Tires will mount right here!