The last row of 5-9 rivets went quickly and well. Then a quick cleaning and light primer coat to be done with the left wing spar. In retrospect, the job of riveting in the standard manner (rivet gun and bucking bar) was not all that difficult. It was certainly time consuming, but not daunting once the skill was honed. I'm quite pleased with the integrity of the part I have made and now look forward to having both spars "hanging on the wall," as it were.