Sounds like a plan, but let me give you some thoughts ...
The Tam Fletcher is in round-bridge/early war (as-commissioned) configuration. By the 44-45 time-frame the class had been receiving extensive refits of weapons to meet the air threat. Additionally, the Navy determined that the round-bridge was not efficient in providing visibility and the bridge-configuration was changed in later ships to what was called the square bridge.
Pick a subject and model it. Excellent online references include NAVSOURCE
http://www.navsource.org/archives/05idx.htm
and NICHOLAS
http://www.ussnicholas.org/
Be prepared to rebuild/replace gun tubs and guns to match the configuration you have chosen. L'Arsenal makes exquisite 40mm, 20mm, and 5-inch guns. When you make your order also look at their 26' MWB. It is much nicer than the kit boat.
http://www.larsenal.com/GB/indexgb.php
Look to them too for MK37 and MK51 directors. They also make resin crew.
Another source of aftermarket details is Yankee Modelworks. They make (made) a 26'MWB and tripod-mounted 20mm guns.
Tom's Modelworks made a square-bridge conversion for the Tam Fletcher. When I heard that Tom Harrison was taking it out of production I wondered why. Then I heard that Trumpeter was makeing a square bridge Fletcher as The Sullivans and I understood why (Tom Harrison has worked with Trump on the Liberty Ship and the Essex kits). If you want to do a square-bridge Fletcher with late-war weapons -- hold off on your build for a while.
As far as brass. Toms, Flagship and Gold Medal all make sets for the Tam Fletcher. The GMM set will likely be your best choice for the various antennas which sprouted on mid-to-late war Fletchers.