I don't know about the hall of armor, but weren't some in the past set used pieces from the movies? Odin's throne and the Helicarrier's command deck, specifically.
Obie had it studied in movie 1, so it was at Stark Industries...
Also, I'm sure they have teamsters put up the props in the booth while the booth is built to specification by the builder teamsters....
Willie, do you mean the actual Iron Man statues or the entire display? Mike DeLisio designed the overall display, and it was Legacy Effects who made all the static suits that were shown.