RE: Receiver question
You can use any servos with any brand receiver, just as long as you have the wiring correct. All servos have a positive lead, negative lead, and a control lead. See the attached diagram for the wiring of the major brand of receivers. To use a different brand of receiver just make sure that you change the wiring to match the receiver you are using. On most plugs there will be a small plastic tab that holds in the plug, lift that up and pull the wire out of the plug. Then reinsert the wires in the proper order.
Hope this helps.
Ken