If I'm not mistaken, Paul Garber found those tin sheds at a military base which was closing and begged for them. He somehow got them moved and erected at Silver Hill.
There is, or will be, a restoration area at the Udvar-Hazy branch at Dulles. I fear that one will no longer be able to get as close the restoration work - just look from a balcony. Maybe connections could solve that problem for some people.