u/bigcrunchcombo1

Trying my hand at building a shed for my backyard. I've gotten to the point where I'm installing my 1x6 fascia(there is no sub fascia). While trying to line up the fasica to account for the roof sheathing, I've found that all the rafters are at different heights, I'm assuming because the birds mouths cuts are out. That is the easiest way to move forward? I will add that this is my first time trying anything like this, any help is appreciated.