Finally done...
I figured out the rear mount by accident tonight when I was trying to fab one for the MINI Cooper.
Here's the rear mount. Basically, I made a clip attached to the rearmost portion of the chassis. It is reinforced in the middle to where the stock body clip fits into. Note that this method does not effect stock body mounting. It clips perfectly into a space that I had already cut out for other clearance issues. This body has mufflers, so I used part of the lower chassis to mount them. It is this lower chassis that makes the mounting possible.
Here's some shots of the car ready to run.
