Got it done. This was mentally tough. I like to be perfect especially with paint. I know however that if I spent the time to construct a paint booth big enough to do this, I would take weeks. Because the interior surfaces will never be seen, I decided that a little dust would not hurt anything.
I had fans and my overhead air filter running but still got a lot of dust on the surfaces. I am not going to worry about it. Once they are riveted together no one will see. Pictures to come.