Stupid idea. Not a floating bridge per se, but taking on the upkeep of 3 ancient vast steel hulks.
Exactly right. What are they going to do when one of those hulls need to be drydocked or risk sinking in place? Who gets to pay for that? (Never mind, I withdraw the question, the same people who always do).
Quite right, the maintenance on those aircraft carriers, even stripped down to the bones, would be much larger than the maintenance on any conventional bridge.