I think your effort looks very good, Budd. One thing I've noticed is that Hasegawa's offerings seem to be intrinsically "toy-like," compared to some others like Trumpeter and even older Fujimi mouldings. That may be subjective, but it's my observation, for what it's worth.
I've dabbled with a few PE fittings, mostly radar since the kits don't seem to come with very good examples, and sometimes are incomplete.
I haven't gotten up the nerve to try railings, yet.
Point is, try something minor, like radar and work your way up to the more complicated stuff. If you are interested, or think it's worthwhile, check the "Pearl Harbor" GB (I did the USS New Orleans) and "Force of Nature" GB (USS Wisconsin). I added some small PE details to each, just to gain some experience and improve the parts that came with the kit.
I found myself to the point where PE was--almost--fun.
Anyway, very nice job on South Dakota. She's a sister to the Alabama, isn't she?
Fair winds and following seas.