The airfoil practice kit arrived. I'm not going to get very far on that until my dimpler arrives. I did make the cuts on the stiffeners - started with snips, but quickly move to the band saw - much easier. The extra rivets for the toolbox have not showed up yet, but I harvested a few from the airfoil to finish the tool box. Still need to redo some rivets. I'm now suspecting that the dimples for the -4's on the ends are not deep enough. Airfoil kit also came with a miscellaneous assembly of a couple plates and an angle. It involved countersinking for a -4 in the angle. I thought I did a good job on the countersinking and adjusted the depth several times until the dimple sat flush, but when I rivetted it together, there seems to be a gap on the backside of the angle. I suspected maybe a burr on the countersink, so I drilled it out and re-did it. Still a gap - might just be a slight bend of the plate. I did practice the edge roller and the two lapped plates turned our really well. Using the squeezer up against the back of the angle is tight and I ended up with some marks on the angle; I need to confirm if these would be acceptable or not on the airplane. Will need to be more careful with that. Overall, very pleased with the rivets though. I bucked all of them instead of the squeezer. The -4's into the angle might need to be countersunk a little deeper. I did set the rivet flush in the hole then added .007" per Section 5; still need to play with that I guess. Seems like it would vary based on the thickness of the skin. I ordered a back-rivet plate from a local steel supplier too. Random primer thought - I think I'm leaning toward full skin prime so probably Ekoprime. Purchases: Back-Rivet Plate Metal4u.com