Played with rafters 4-5 hours. Not sure accomplished anything. Had eleven. Since went with 12 foot extension for total of 22 feet, need twelve. If doing one foot overhang, need two more unassembled. They will get attached to sheathing/standoffs and not be gusseted.
So...I'd cut enough pieces to build 3. Laid one out and built a jig off it. Gusseted both sides of it. Then started trying the others I'd assembled months ago in the jig. 5 fit nicely, 4 needed little persuading but acceptable, couple were fugly. Off good 1/2" on one leg. Flipped & flopped. Just not right. I cut the gussets on one to try to get it to fit. Appears have couple upper part that weren't assembled/cut at correct angle at peak. They have mending plates. You don't tweak those babies. Maybe drill couple holes and use come-along to pull it together a bit? Could get like juggling chainsaws. Chit happens quickly.
Getting dangerously close to tossing them in a pile & starting over. Take fourteen--16 foot 2x4 or whole pile of studs with ton of waste. Problem with 16 foot 2x4's is, they usually been crooked as hill! If I do them all over will build them according to shed blueprints. Will fit on 10 foot span with no trickery.