The whole flight deck and hanger arrangement looks as if it has just been dropped onto the unmodified BB model and could just as simply be lifted off again.
As far as BB modernisations go I like the ideas people were presenting on my KGV thread with Mk13s replacing secondary armament rather than the big guns improving the ships defences (and offensive) capability and retaining the reason to keep the BBs at all the big guns. The UK designs with their mid ships hangers and secondary armament positions / magazines would have been great for various air defence, anti-ship, anti-submarine and surface attack missiles. If fewer big guns were needed then supress the after turrets for more missiles of simply for a very large hanger and flight deck for lots of Helos, ASW, attack, assault, troop accommodation etc.