Well, there may be a different way, but I can tell you that as a
carpenter
I estimated building my own hanger instead of ordering one. The cost
difference
was minimal. The part that was a money saver was the hanger door.
Instead
of paying the big money for a folding door, I came up (on paper) with
a panel
system very similiar to the glass doors you see at malls that fold up
into a pocket.
The doors would be made of plywood and each one would have a barrel to
set into
the concrete floor. In other words, you will probebly be better off
with a commercial
building.
Lou