so after a pause in the construction to improve my fixture i made some new progress.
having a reliable easy to set up fixture made sizing, mitering, and checking fit of the chainstays a breeze. once the fixture is set to the proper height and length i can keep checking the fit of the stays as i cope them.
with a little help from the framebuilders list, alex w, a protractor, and BG101 (by martin manning, cant find a download link), i sorted out my chainstay length and miter angles.
everything cut to length and mocked up.
tacked the chainstays to the BB shell, then tacked and fully brazed the dropouts onto the other end, then returned the the BB shell and finished off the fillets. didnt come out as clean as the other fillets, the BB shell/chainstays is a pretty tough one to nail on your second try.