I don't know for sure, because frankly I never studied location of doors and how many on FLETCHERS.
Off the top of my head the changes you are seeing in doors on the bridge "may" have more to do with mods happening over time during construction across the board ... and maybe during overhauls as an upgrade ... than with a specific yard doing things their way. Nothing much of a serious nature was done differently on the FLETCHER class without APPROVAL of BuShips and there was a reason ... better access, need to block access to some area. There were a lot of changes going on with the "new Open Square-Bridge" particularly on the Navigation Bridge throughout the war. There were constants; the pilothouse basics stated the same, the access to the lower level was in the same place, and the Mk 37 director tube was in the same location.
I have noted other places where doors ended up being blocked by changes add were left in place closed, serving NO PURPOSE.
As you can see from just a sampling of bridges of FLETCHERS (
I went through ALL of the BGPs of FLETCHERS at NARA and took digital camera views of parts of them, but only took views of the bridges on some ... they all looked a like at the time) over time and builders, the layout changed. Sorry I didn't have any bridge views of GREGORY among these views. Note the the BIW-built Square-Bridge unit and the Federal-built Square-Bridge BGP views look very similar. Experience is that on many things BIW and Federal as "lead" yards did things pretty much the same. The differences in doors seem to be due to changes in the bridge internal layout. That door on the aft or portside aft of the bridge ... served a USEFUL purpose for bridge crew COMFORT.
As for defining one type of bridge from another, I think doing as I have done on some aspects of the FLETCHER Class when I had no idea of what was going on, I would define a feature as Type 1, Type 2, Type 2a, etc. Making up a list of which FLETCHERs had which bridge type and maybe WHEN, would take quite a bit of effort. It can be done, but not in one evening.
USS ISHERWOOD (DD-520) Beth-SI built in Apr 1943, appearance in 1959
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USS PRICHETT (DD-561) Sea-Tac built in Jan 1944, appearance in 1967
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USS McCORD (DD-534) Beth-SF built in Aug 1943, appearance in 1943
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USS FRANKS (DD-554) Sea-Tac built in Jul 1943, appearance in 1945
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USS NORMAN SCOTT (DD-690) BIW built in Nov 1943, appearance in 1944
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USS BULLARD (DD-660) Federal built in Mar 1943, appearance in 1943
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