Looking at models you specified, Patapsco-class gasoline tanker looks awfully similar to small tanker that is present in SH5 TWoS (and probably in SH3 as well, since it looks like it's imported to SH5 from SH3). File name is NLTSf, game calls it "Small Tanker 1850t":
As for Crescent City, theres a plan here:
https://www.navsource.org/archives/10/03/100302113.jpg
Not detailed enough for hull modeling but according to Wikipedia these ships were based on C3 hulls so perhaps you can use C3 plan for modeling hull and the navsource one for superstructure.