Okay, that works, too.
Do you use an FM radio?
For 2.4GHz, you will have to make sure that you can bind to two receivers at the same time (don't think this works) or switch models (computer transmitter) between chassis and crane (probably better).
EDIT:
Have to correct myself:
http://www.helireviews.com/fly-sky-f...h-transmitter/
Unless your 2.4 GHz transmitter behaves differently, this means that the transmitter will always send the same code and so different receivers (chassis and crane) will all listen to the same signals. You could still have signals 1-3 in the chassis and 4-7 (or so) in the crane. Hope this makes sense.
As to your design:
I do not see how you fix the gear to the chassis.
How is the bearing held in position?
I do not see how you deal with the axial loads.
The axial bearing should have a large diameter to create a stable platform.
What is the flange bearing in your drawing? The large plate?
I don't understand.
Cheers
Jens