Would a Revenge-class hull make a good aircraft-carrier conversion?
Short answerNo; Renown would be better, and an Admiral-class hull would be better still.
NotesThe answer is driven by the speed and proportions needed for flight operations rather than the amount of armor available for reuse. A Revenge-class battleship is too slow to create the wind-over-deck margin expected of a fleet carrier. Renown's battlecruiser hull is a much stronger possibility. An Admiral-class hull is better still because its length and speed support a large flight deck without forcing the conversion to overcome the fundamental limits of a slow battleship.