G- Factor makes (made) a set of 1:144 white brass alloy guns/armament for the Revell Fletcher. Includes a 20mm, a dual 40mm, a ready service locker, and a MK51 director.
Nautilus Models offers a 1:144 scale PE set with gun details as well as inclined ladders and other details (stanchions to rig with thread - not railings).
Tom's Modelworks has the rights to produce the former WEM resin details. Right now Toms is working on bringing the PE products back online