The Formidable, Victorious and Indomitable were all the same class as Illustrious but with different hangar design. Were they different enough externally to require a new model?
And last question, they and Illustrious were refitted at different navy yards and at different times before deploying to the Pacific, but did that change their external appearance requiring a new model?
Thanks in advance. I don't have any references that give answers to these questions.