For fishing wires through the wing I have a long piece of ceiling fan pull chain. Just drop the end in the hole and it will fall through the holes in the ribs. You can buy the chain at the home improvement stores in the lighting dept. They use to have it on large spools.

I tape the servo plug to the chain with masking tape and shape the tape to a point to help it through the holes. I like the plastic wrap idea. I gotta try that one.