How much of a cruiser could Dominion yards build?

Would Dominion-built cruisers have used locally built hulls with engines and guns supplied from Britain?

No. They could produce most of the ship after sustained investment, although specialized eight-inch guns might still have been imported from Britain.

Dominion yards could have developed beyond assembling British engines and weapons inside locally built hulls. Cockatoo Island demonstrates the breadth of Australian plant and machinery already available, and sustained investment could have expanded similar capabilities in Canada and India. The likely imported exception was the eight-inch gun, while the hull, turbines, and most other systems could increasingly be produced in the country building the ship. Recurring construction would have developed local skills as well as delivered finished warships.