Finished riveting the horizontal stab this morning. I measured it and the only fault I can find is that the left and right leading edges differ by a shy 1/16 of an inch. I think that is ok but if I was going to do it again, when I pulled each leading edge to the line on the skins I would use a string to verify they were even. I think when you line up the holes on the line there is room for small errors.