I clamped the wing attach fittings to front and aft outboard spars. I possitioned the fuselage so that the longerons were completely level. I measured out the wing tip hights and fitted a solid rib to the end. I secured the tips at the correct height with a jig and confirmed a 3.5 degree incidence at the root and a 0.5 degree incidence at the tip for correct angle of washout. I used a wing attach drill jig to drill all the holes through the spars. The wing attach fittings were then securely fastened in place with AN bolts and nuts.