Converting Courageous and Glorious along Eagle's lines

Why were Courageous and Glorious converted like Furious rather than Eagle, and what if Eagle's model were used?

Furious was the easier related-hull precedent; an Eagle-style conversion would add taller hangars and islands and might influence later carrier design.

Furious supplied a convenient conversion model because the three Courageous-class hulls were closely related. Reusing that work made the conversion straightforward. An Eagle-based approach is expected to give the ships taller hangars, with twenty feet proposed in the answer, and islands from the outset. Hangar height would matter for compatibility with larger American aircraft later on. The ships would become slightly larger and heavier without greatly changing their air groups. Three carriers built that way could establish a different pattern for subsequent British designs.