Music wire is much too hard. Buy a rod threaded at one end. Easy to bend in a vise then tap with a hammer to tighten up the radius. Cut the brass bearing tube to length, slide it over the rod and then bend the other end to fit. Be sure to make right and left hand wires!

My preference with the barndoor ailerons shown on your plan would have been to install two servos and eliminate the torque wires. Opinion- torque wires are easy to make but a bear to install with everything aligned precisely.