Almost done sanding prior to sheeting. One more short session left to remove some remaining high spots. All the ribs are now flat relative to one another. This was challenging as the wing changes from root to tip. The wing has a swept leading edge and straight trailing edge meanwhile the centre of the spar transitions from about 35 or 40%% of the chord at the root to about 25% of the chord at the tip. This plays with your mind as you're trying to align the sanding pad properly in relation to the ribs. And lastly, the airfoil changes from root to tip. All of these factors play into a wing profile that changes throughout the entire structure. The goal is to build a wing will turn out smooth with minimum filler ;-)