Worked on preping left wing for covering. Roughed and cleaned the areas where the fabric glue gets applied. Layed out the rib stiching using 2 1/2" centers on the top rib capstrips. It looks like it will work out well to lay the stiching out by putting a stitch on each side of the rear spar which is 2 1/2" wide then progressing on 2 1/2" spacing in each direction. I then leveled the wings and used a string line and blumbob to transfer the marks to the lower ribs. after laying everything out I could see that the stitches clear all the internal parts of the wings.