Help assemble coaxial helicopter with pixhawk

hello, kindly help me assemble pixhawk , futaba rx, and how to connect my coaxial helicopter. Thank you in advance

@samzy if this is a true coaxial helicopter, meaning the rotor speed is constant and the pilot controls collective and cyclic pitch of the blades, then you should post in the traditional helicopter subsection of arducopter. I can move your post there if that is the case. Your post will get more attention there.