Don't forget the PTGBs.
http://www.ptboatworld.com/photos2.htm I know this is a higgins boat But some elco boats where fitted out with 2x 40 MM bofars and 50 cals as much as there was room for also. One PTGB per 2 or 3 PTs could give the squadron some punch. I'm wandering why They didn't bolt on a Quad 50 mount amidships. Since PT boats and Schnell Bootes operated as squadrons or gruppes, a mod for hunting with a task force, or squadron would be desirable. Since we have playable destroyers this should work for all sorts of folks. I think they had grey float coats in WW2. Good luck with this project. V/R CL