Finished all the hinging today, wing and tail feathers, and took the nacelles off the wing so I can start the engine installation tomorrow. I noticed another "short screw" problem- the forward 1/4-20 nylon bolts that hold the nacelles on are not long enough. There is barely 1/8" thread engagement in the blind nuts. The rear bolts are OK. Basic rule on bolts is thread engagement should equal the diameter of the bolt.