Servo mounts. Recall from above that the left panel was installed before building the right panel. Look closely at the photo below, and realize that I very carefully copied each dimension from the bottom of the left panel (right side of the photo, the wing is upside down) to the right panel, and then made the cut-out and the internal stuff to mount the servo. Then i step back, and say "you dumb sh*t, you forgot to mirror image the dimensions"

My only excuse is that the muffler is on the right side, so mounting the left servo further out will help compensate for the weight. (it won't make a bit of difference, but sounds like a good explaination)