Thanks Marc and KBS, I did some searching and found a few mfg's who make hi-lift tracks that look like this but not sure if they are exactly what I need for my project.
Marc, are the bends on the door track manufactured? If so, by who? I am trying to do a similar thing with a 7 ft door to a 9 1/2 ft ceiling and am about to fabricate my own bends using old track sections.