Started drilling holes in top of ribs for fabric rivets,.Made a jig to drill holes in center, but didn't like how the holes were coming out, so abandoned method and will think some more.Measured between wing boxes to determine rib spacing. Works out to 10 3/8 with 14 ribs.Started drilling and clecoing wing ribs.Taped all ribs into positionLooks great, starting to look like a wing!