Hi Paul!
Oh thats a problem! As your radio only got 4 channels.
-steering
-motor controller
-smx needs one
that makes three. What about a gearbox? If you have a 3 speed one you have to look into buying a new radio as well
You have to buy the leds seperately. Servonaut has a set on offer but in Germany its cheaper buying it somewere else. If you want to buy it all together, got for it.
The speaker depends on the voltage so 12V or 7.2V. They sell the speakers as well. "LAUT85" and "LAUT45".