Hello,
I've also made 42022 RC PF mod. Unfortunately I don't own L-motor, so I've used M-motor which is really crappy thing to mount.
Mod contains 1x M-motor (main engine), 1x Servo Motor (steering), 1x LED lights, 1x Power Box, 1x RC receiver, 1x RC pilot.
Below video and images of my mod.
Currently I plan to disassemble this and make RC version of C-Model Truck.
https://www.youtube....h?v=BxP1osSGT2U