Glojo
The last ships with steam propulsion (standfast our nuclear subs) were built in the 60s. We haven't had a boiler room on anything since Fearless & Intrepid. QEC has electric propulsion, with gas-turbine and diesel generators.
As for F35, the Marine Corps variant (the risky one) is the STOVL F35B. F35C is a "normal"(!) aeroplane.
Your info re beam is flat wrong. Ark was 58m at her widest, QEC will be just shy of 70m.
Dr Lewis has been remarkably quiet for the last 18 months.....