I just happened on this forum while trying to figure out how to do the soffit on my garage project.
We just moved here from Kamloops BC for work and bought a place without a garage, needless to say the house was packed with stuff that desperately wanted to be in a garage. We built a 31'x24' (32x24 would have been more than 750 sq ft, requiring rezoning!) garage with a 16' door and a man door in the "work area". It's gone pretty good so far, few little hiccups but nothing too major. The end is in sight!
Looks like a great resource, the thread called "Do you start gable soffit from the top down??"
Answered my first question about how to transition from the gable to the eave soffit.