Rick, thanks for all the info and help! I've just read all 21 pages of this thread, which I will later reread for more info. This can certainly become an addiction!!
Your diagrams showing the 20mm placements were great!
I also dug through many photos of sister ships on Navsource, Destroyerhistory.org, destroyersonline, ussfletcher.org, and navyyardassociates. Lots of great pics, but not much on DeHaven.
My questions:
1)Would it make sense to mount Ready Service lockers atop the pilothouse to service the 2 20mm guns?
2)Should I keep the railings atop the pilothouse? (I think shields required yardwork (?) and the blurry pic of her seems to show railing.)
3)Were the RS lockers for the amidships 20mm guns reduced when she had two of the mounts removed?
4)Would the fantail 40mm have an associated director and tub such as, I believe, the Strong had?
5)Was the revised lower deckhouse tub between mounts 53 and 54 similar to Strong or Harrison?
6)Would DeHaven also have had the L'Arsenal-style anti-skid deckmats?
Sorry if there are too many questions!

I'm looking forward to a fairly accurate, but not rivet-counter or Advanced Modeler Syndrome, build.
Thanks again in advance...and for answering my previous post so quickly!
Daniel "On the Left Coast" Chavez