alignment
I too had the wing tip issue, and I can tell you, if it's off, your airplane will have heavy wing issues. I had to fix mine after I was flying for a while, so I aligned them this way:
First, I double checked my aileron adjustments, and set the flaps to match.
After making sure I was right on with the adjustment, I sawed the wingtips.
Then, I clamped a very straight piece of oak lumber to the flap AND aileron with the end of the board extended past the wing tip. Drilled a few holes in the tip and the board, and clecoed it down. I then epoxied and floxed the tip together. Next, I removed the tips, and mixed up some sloppy flox, and poured it down into the wingtip trailing edge to cure. Sand and repaint.
What I ended up with was perfectly straight tips, and a level trimmed up airplane. What a difference it made!!
Hope this helps,
Chris