I'm doing the top and sides together using the envelope technique. Two pieces are sewn together right at the top spline then glued in place.
Start by drapping oversized piece on one side, clamp and pin in place, mark the joint with a number pencil, remove, pin to another piece fabric the same size, sewn on the line, cut the excess and glue in place. Sounds easy, I've been working about 8 hours so far and still a ways to go. It's a long way around the fuselage and I got all the trimming left.