From X Model to N ---Boeing 707-300

I ask the mechanic that stayed behind to shoot a picture of our bird after a "D" check. We were going from an "X" model aircraft to an "N" model 707-300 "Combi". This was the biggest challenge I experienced while a Mechanic-Flight Engineer for the NMB corporation..Our returned trip was from Orlando to Phoenix ,Hawaii,Siapan to the home base of Singapore.