I'm quite glad to see this new sub-heading.
After all, of all the great film directors, I really don't know of anyone who has had more documentary films made about them, than Orson Welles.
The documentary films on Welles are probably just as numerous as the books about him. The BBC FOUR documentary, hosted by Simon Callow, being the latest.
There is also a documentary on several countries Welles stayed in while he was in Europe: Italy, Spain, Yugoslavia. France and England are addressed in Simon Callow's "Welles Over Europe."
Then, add to that all the documentaries about Welles's entire career, or certain sections of it. THE BATTLE OVER CITIZEN KANE. The making of IT'S ALL TRUE. The A & E biographies. The LOST FILMS OF ORSON WELLES (ONE MAN BAND).
Perhaps the next "documentary" will be the making of THE OTHER SIDE OF THE WIND for Showtime.

