Imagine the crater that thing would make if it lost power.
You could actually build this thing.
Of course you would need multiple nuclear reactors able to provide a LOT more power than a current carrier.
It would take several times as much power to lift a carrier vs pushing one in the water at 35knots.
It would need to be made of light-weight metals and composits.
It would need more than 4 fans for safety...hooked to multiple power plants, also for safety.
Redundancy would be the watchword.