I did not install the rear spar and it did make it a lot easier to install the ribs. On the left side I will install them one at a time and then it will even be easier. I would install the #13 rib and then work back to the #1 rib being inboard. If you are left handed I would do the reverse. I will leave the rear spar out till I install the leading edge because of the problems that I have read about installing the leading edge. I will see.
