DO NOT use Econokote. It is NOT fuel proof, only fuel resistant. Use standard Monokote.
Cut the torn covering back until you hit wood, then recover the whole panel. It's much less noticeable that way. Iron down the edges and shrink tight.

A drill press will align your horn holes, if the aileron isn't already installed. I use a pin vise to drill those holes. You can get them pretty well aligned with a little practice. Use 3/4" #2 screws. If the holes are a little misaligned, you can move them enough to get the screws started. Start one screw, then wiggle everything until the other sits in the backplate hole. Use side cutters to nip off the excess. Takes about 5 minutes per horn.

Dr.1