I've tried the project with mounting on the diff, but I didn't like how low the wheels become, also it didnt work nice with my shocks from 14001, so I decided to mount it on top of the body,
also put on top of it the rear light.
More details on the channel - https://bit.ly/LeoRc
original post - https://www.thingiverse.com/thing:6556634
The author remixed this model.
not much from original is left - only top mounting section