volkan,
Measure the depth of the holes in the wing panels for the alu joiners before you cut them. Remember the longer joiner goes to the rear. the 1deg out was at the front of the wing. I have heard that they may have been built by deaf and blind builders as the quality varies greatly from model to model. As with the covering that is another story. I am thinking of recovering mine from scratch as it has started lifting again.

Cheers.