I started fitting the Left wing tip to the wing. It amounts to a lot of small trim cuts until it fits reasonably well. Remember, you need a 1/4 inch gap at the rear next to the aileron for easy aileron movement. After a lot of thought, I decided to utilize hinge attachment vs screws. More on that soon. Right now I am getting the position as correct as I can.
Trace wing end onto foam, cut pieces out and push them into tip to hold shape while fitting.
Keep trimming to get a 1/4 inch finish opening. Cut less and then file to final 1/4 inch later.
Tape wing tip aft rib into place to check tip shape vs aileron. They should match.
