A County-cruiser hull would make a fast but small carrier

How would a carrier based on County- or Town-class cruiser hull and machinery work?

It would probably be a small, high-speed escort carrier rather than a true fleet carrier.

County- or Town-class dimensions would not provide enough volume for a large air group and the support spaces of a fleet carrier. Their cruiser machinery could, however, give a conversion much more speed than a merchant-based escort carrier. The likely result is a compact aviation ship useful for escort and support tasks where speed has value. The answer illustrates how a donor hull's size limits its role even when its propulsion is attractive.