The 40mm mount atop the aft deckhouse in the kit is like the surviving USS Kidd, which like Melvin was built at Federal Shipyard. But I saw an overhead photo of Melvin's twin, the USS McNair (DD679) so made the 40mm mount like the McNair, and as illustrated in this attached photo. The 40mm director on Melvin was just a raised platform with handrails, but like so many other parts on this model , I kept with the theme of "toy-like" rather than truly scale fabrication.
And yes, it is raining here in So. California - a rare opportunity to be cooped up inside and work on Melvin.