I bought the Yankee Modelworks backdate set for my Trumpeter CV-2. It contained the 4 8in turrets in resin with white metal barrels, lots more resin parts for the much different superstructure profile. a really nice fret of brass PE for railings, ladders, davits, pri-fly, and the 8in gun director houses.
It was my first attempt at using resin parts but, it turns out that resin handles like a cross between fairly soft wood and soft plastic.. VERY easy to work with. Just measure a whole bunch of times and only cut once.
BTW...I got my Lex and Trumpy's 1/350 USS North Carolina on the clearance table at Hobby Lobby
for $50 each.
All the best
Ray