RE: Repairing the covering
Before I even took my trainer up for it's maiden flight it was a victom to many episodes of Hanger Rash. (That will happen when you build it and don't fly it for 10 years and move many times in those 10 years.)
I had things poke thru the covering, and I just cut a small piece of monocoat then ironed it over the puncture.
I had the tail chopped off by a falling ladder, I epoxied the tail back on with some reinforcement, and then removed the covering around the repair, then overlapped the new covering over the old covering.
I had tears in the covering on the wing, I just patched it like I did the poked holes.
It may not be the prettiest bird in the sky, but it flies just fine.
I might go back and recover it, but I doubt it. It is a trainer, and I plan to let other family members learn to fly on it. I am sure it will have more scars on it eventually. Just gives it some character.