Ooooo, too bad you blocked the space between the rafters at the top of the walls. Either remove that blocking or drill as many 1" holes in them as you can.Still working on priming the inside.
It wouldn't be fun, especially as it looks like you have caulking or construction glue where the fascia attaches to the rafter ends.How would we extend the roof when it's already installed?
Rafters can be extended, see My Coop page, but the blocking is in the way.