Hey, the structure looks good to me and as long as you're happy with it, I'm sure its fine. There's been a lot worse put together that has stood for a long time...
Glad you got it figured out. Whenever I build rafters, I always cheat and use AutoCAD to do a rafter layout. As long as my real world dimensions are correct, the rafters fit as tight as a person can get them, using imperfect tools and materials of course.
Good job.