I just had a stupid idea, I get those constantly. Trace the wing saddle curve onto a piece of paper. Do it again on other side on another sheet. Cut useless paper away with scissors (I had to go to Staples online to figure out how to spell scissors). Place sheets together with tracings forming a symmetrical wing form. Adjust fit for proper leading edge and enough square in back for aileron stock of your choice. Tape together. You now have a template for a fully symmetrical wing. Wing rib template = wing template - LE stock - TE stock - sheeting - spars. It appears that your plane makes no allowances for inboard tapered TE. At this point it is just a matter of cutting ribs, and building your new and improved wing. Of course I could be making a gross error here.