Thank you Kamcoman77! Similar approach, working with wings in the vertical position, clamped a (139") straight edge to the bottom of front spar where the nose ribs have the notch for alignment, then using a combination square to measure the height of nose stringer at each rib, then adjusted to (+ or - .015"). I'll find out after using your 2' sanding board if that's close enough. Crummy pic attached.