Were Courageous and Glorious rebuilt with continuous single flight decks before the Second World War?
Short answerNo. Both were sunk while still carrying the lower flying-off-deck configuration.
NotesNeither Courageous nor Glorious was rebuilt into a continuous single-flight-deck carrier before the war. The lower flying-off opening therefore remained part of the configuration in which both ships were lost. Japanese carriers with similar multiple-deck layouts did receive later single-deck rebuilds. Disusing an opening did not reconstruct either British ship around one continuous flight deck.