Eh, the only repair article I found was the sheeting repair which I found extremely helpful now I do my covering repairs in a similar fashion (instead of the bed I stretch the covering about 0.5cm in each direction over the old covering. The other steps and advice helps remove sagging in the repaired covering.

I was wondering if anyone haad tip on repairing damaged ribs without adding too much weight. I tried reinforcing from both sides (too much weight) then from one side (lasted about one crash longer than doublesided reinforcements) but simply ripping them out and placing new ones resulted in a weak repaired rib.

I would also like to contribute a tip myself. On my second trainer (I still have a beat up wing from it) I was able to destroy a section of the leading edge during a crash. My solution was quite simple. I chopped out a generous section of the leading edge spar along with the damaged sheeting. I then filled the whole first third of the wing with high expansion foam from Home Depot I sanded off the excess foam and covered it with packing tape (It was late evening stores were closed, I wanted to fly the next day, and I had no covering) THe reapair lasted through the rest of the plane's life (I got it used and the hinges finally came loose becausee of fuel-soaked balsa).