Believe it or not, I have seen one. I work for the federal government, and part of my job responsibilities includes reviewing requests under the Freedom of Information Act ("FOIA"😉. When someone makes a request under FOIA, it is ultimately reviewed by a lawyer, along with the requested material. This request came to me, for reasons that are not germane here. The requester was a doctoral candidate from a southern university, writing his dissertation on the Secret Service.
The blueprint that I saw was much smaller than the ones described by Monel Funkawitz, and was only a few pages - presumably the records custodian had compacted the full-blown blueprint into something more readily useable.
I believe that, for the most part, the makers of the film "Air Force One" were privy to the layout of the actual plane. The White House has previously announced, though, that AFO does NOT have an escape pod as portrayed in the movie.