I considered doing something similar IMTL as this. Eventually went with a sixth QE with small tube boilers and higher speed.HMS Leopard 1915 half sister of HMS Tiger the main modification was the switch to solely oil fired small tube boilers and an increase in the armoured belt. Fought at Jutland and took fire off Queen Mary at a critical moment allegedly allowing her to survive. Claimed the fatal hits on Seydlitz but this is disputed. Three Majestic class ships were decommissioned to provide trained crew for her.
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