Hi Guys,
Thomas,
The "black boxes", that you referred to are the life raft baskets. On most modern USN ships they are encapsulated, but on the Iowas' they were in baskets, (like many USN ships from the 60's forward). There were more than one kind of life raft baskets at the same time, but that's all I can say without doing more research. Suffice it to say; the Iowa's had the life raft baskets that were not encapsulated, and they looked like black, "boxes".
Here are some of these life raft baskets that come with JAG's CGN-9 Long Beach. They are the multiples of "squares", on the flat sheet near the hull of LB.

Here they are in place on Missouri, Desert Storm

I ordered these separate from JAG, and I will be ordering more for my current New Jersey project. Good people at JAG! I'd also recommend their 16" turrets!
Here is a picture of the upper fire control tower enclosed structure that Trumpeter leaves open on top. Trumpeter's is the wrong shape, (according to the scale drawings in the Stillwell book). I scratch built this part of Missouri, as the New Jersey kit by Tamiya is different in this area. The New Jersey was unique in this area.

If you don't want to hear about all of the Trumpeter kits' foibles, then I'll refrain any further. I know, this is supposed to be fun

, but it's hard not to share what I've learned...sometimes.
The "crane" you referred to is the starboard side unrep station, ( I assume). If you follow the GMM instructions and use all of the p/e provided and follow the scratch-build instructions...this part of the ship comes alive!
Have you seen the BB64's main deck and its' individuality? Just, go back a few pages on this thread

.
faithfully submitted, Tony Bunch