How treaty limits constrained Town-class cruisers

What might the Town-class cruisers have looked like without treaty restrictions?

Probably somewhat larger and better protected, with more machinery power and fuel, but not necessarily enlarged to the most extreme foreign cruiser dimensions.

An unrestricted Town class probably would not have expanded to the size of the largest foreign cruisers raised in the question. A somewhat larger British design is more plausible. The extra displacement would most likely have gone into stronger armor, more powerful engines, and additional fuel. Treaty relief would have improved practical margins without abandoning the class's basic design logic.