Thanks Eric,I kind of like your idea of leaving half of the doors closed.I never thought of that.
First I will have to investigate weather sliding doors ,like option 6, existed in the 20s.I remember that my grandfather had a garage door that swung up and in and used counter weights of some sort.I am sure that that door was from the turn of the century.I know that in Canada most of the doors that I have seen have those racks on both sides to house the hangar doors when open.
I have a painting of a hangar at the Toronto airport from 1938 with no racks on the side and I wonder where the doors were housed? Cheers! John.