Took the aft fuselage out of the fixture and put it on a blanket lined plywood sheet. I then loaded the inside of the fuselage with pillows and foam near the bulkheads. Next I got my fairly thin son to crawl into the fuselage and hold the bucking bar while I hit the remaining rivets on the RH skin. We were able to get the whole job done in about 45 minutes of riveting time. The actual riveting is not what takes time in building an airplane! I continued to use the "back hitting technique to get the rivets to sit smoothly. That is, after the rivet is set, you use the bucking bar to hit the rivet in the inside and knock the riveting dent out of the skin. It makes for a much more unifor appearance on the outside.