A G3 carrier would have approached Lexington dimensions

Would a G3 carrier have been larger than the Lexington-class carriers?

It would probably have been about the same overall size, with a different British secondary and anti-aircraft battery.

The battlecruiser G3 was already 856 feet long, making a carrier conversion of roughly 880 feet overall plausible. Its beam would remain comparable to the Lexington class, placing both designs in the same broad size category. The British ship would probably omit Lexington's 8-inch battery in favor of 6-inch secondary guns and 4.7-inch anti-aircraft weapons. Overall flight-deck length also differs from the hull length that must enter a dry dock, since the deck can overhang the docked structure. The comparison gives the counterfactual conversion concrete dimensions and shows national differences in early carrier armament and support requirements.