Could the G3 or N3 designs have been converted into aircraft carriers?
Short answerThe G3s could; their early construction state allowed an almost purpose-built carrier, while the N3s had not progressed enough to offer the same route.
NotesThe G3s had progressed far enough for a carrier conversion to be plausible, unlike the later N3 battleships. Yet their construction was still so early that designers would not be trapped by a completed battleship hull. Existing keel work and ordered machinery could satisfy the legal fiction of conversion while allowing a nearly purpose-built flight-deck arrangement. The resulting ships are expected to compare favorably with Lexington and Saratoga rather than inherit the compromises of a late conversion.