RE: Biplane aileron setup
I have a .60 sized Reactor Bi-plane so I understand exactly what you are going through.
The way this plane is configured you're either using "Y"'s for a combined setup or extensions for an individual setup. Dammed if you do and dammed if you don't. It really comes down to, are you assembling at the field or does it stay assembled week to week and get transported assembled. ????
If using "Y"s then you really need to "Y" the top and "Y" the bottom not the left and right. You need to come up through the center post and if you assemble at the field then the wire going up through the center post needs to stay in place so you don't have to fight fishing a wire through there each time you go and fly
Also with the double elevator servos they need to be on seperate channels with a proper mix otherwise you would need to "Y" them and also have a servo reverser for one side.
I assemble mine at the field and fly with a Dx6i and 6 channel Rx so individual servos was not an option for me.