Only thing that it looks to me to be without further info is that the ailerons were reveresed. Its easy to miss some things when you are anxious for a maiden flight. I missed some revered ailerons prior to the maiden flight on my Stuka. I was just checking that everything moved with the sticks. Another pilot was watching and noticed that they were backwards!! Owe him a few beers for that one! I put together an SS 40 last fall and managed to get in several flights on it before winter. No problems that I can see. Flys rock stable fast or slow!