Don't let a little surface rust deter you. Yes, it's a poor way to store them, but they'd have needed to be sandblasted and stripped prior to restoration anyway. The heavy mechanical parts are of hardened steel and are fine under any patina they've acquired.
If anyone here is that concerned, start asking around among people you know about donating some indoor storage for the cars which are the most susceptible to damage. Someone well connected should also ask to go in and drill a couple holes in the floors of them to facilitate drainage.
I hear a lot of whining here, but not a lot of "let me see what I can do."
YOU could be the "THEY" who is always expected to do something.