Thank you both. Bill, I've found your builds EXTREMELY helpful. Your posts, as well as others here were able to answer questions I never even considered asking!!! I am truly surrounded by master builders here! The master for the turret was actually my first scratchbuilding project, several years ago. I built that, cast several copies, fabricated the Michigans armored conning tower, started the hull and promptly lost steam and headway on the project. (Bit off more than I could chew...) The Arkansas is now my primer for scratchbuilding in large (for me) scale. The hull of the Michigan is starting to look good instead if intimidating... Jim, I might need to import one or two of your pet spiders... And maybe your parts-shrinking ray as well.
Here's an update:
The barrels are made from aluminum and brass tube that came from the parts box...
I now know the sliding hatches aren't prototypical but they add so much to the turret top that I can't bring myself to remove them...
I turned the stack on my mini-lathe last night. It is aluminum. The upper deck is .040 scribed sheet.
Next, The conning tower, wheelhouse and the 1001 fiddly little detail pieces that bring a model to life...