There are two XL engines for driving and one M engine for steering. It is quite fast and relatively powerful as for this kind of car due to two XL engines used and the gear ratio @ 1:1.667.
The biggest problem I have during tests is that the steering bar is disconnecting from ball joint when there are to many obstacles in the way.
Another issue is that the model is a little low and it is hanging on even not very big stones when driving.
There is independent suspension at the front (modified 8880 solution) and there is modified pendular axle at the back (a little modified Sariel's project used in his Jeep Wrangler).
First idea was to use 8879 Speed Remote Control to control the speed and standard 8885 Remote Control for steering, but it appears not to be very practical solution and all is controlled with 8885 now.
There is video from my tests coming soon.
I have a plan to raise the body slightly, add a proper 2-gear gearbox and, if there is still enough room, add a mock engine.