A couple months ago i bought an ultra stick and a 6 channel Futaba transmitter. Now i would like to fly more than once a week, and i am thinking of getting a small aerobatic electric plane. I already have a 6 channel transmitter and standard receiver, along with a 3 channel hitec transmitter and 4 channel hitec micro receiver from a previous plane. Would the six channel standard receiver work with the new electric plane? Could i use the six channel Futaba transmitter with a 4 channel hitec micro receiver if i only need to use 4 channels? Could any 6 channel transmitter work with a 4 channel receiver? What should i do, if i am trying to keep a low budget?

P.S: The new plane would probably have a 31" wingspan, and a t-370 electric brushed engine.