Somebody was, but it was one of those mods full of sound and fury, signifying nothing...
I don't think it's possible to appreciate how difficult such a mod is to make unless you try it. If I remember right, this guy got about halfway through. We're too hard on modders that tackle a huge project, find out they have swam halfway across the Atlantic and don't think they can make it. So they sometimes swim back!
I belong to the Ducimus school of eyecandy. If it doesn't help the game, a beautiful target you might see once in a career, if it slows down game execution, then eyecandy be damned!
But Pearl Harbor in that kind of detail wouldn't be useless eyecandy. It would set the mood for the entire game and be seen by everyone using it as a base every time they played. Can you imagine starting out a cruise in early 1942 in Pearl, surrounded by sunken hulks of formerly proud ships of the US Navy reminding you of why you were here? Pearl Harbor would be a priceless addition to SH4.
