Post your 42122 mods here. I have added the steering and 4x4 based on the idea form @Zerobricks. But also added RC stuff (small motor, servo, IR and recharchable battery) It is not done yet, the rear axle is only a placeholder, iam waiting on parts for that (ball joint and socket like front axle has). Rechareable battery box will go on top of the servo / behind the IR reciever! The small driving motor sits under the hood and has a small gear reduction from an 8 tooth to a 24 tooth gear. Then it goes through 4 16 tooth gears (red one spins free for steering to go through), to both axles. The servo sits in the back (also backwards) it steers only the front axle with 4 universal joints going through the chassis from back to front.