Really good idea and it feels more realistic. However this looks more like emulation rather than simulation to me. Each sound produce quite an echo every time and this sound "travels" back and forth like 3-4 times and it creates sound mess. I never fired 88 gun at open sea at freighter in reality

so I cant say if this is bug or feature, but it would be good to know how this mod works so we can decrease or even disable echo a little by ourselves.
I tried to delete some extra sound files, but they probably used not only to emulate echo sounds but to emulate source sounds at predefined ranges as well, so eventually it leads to silence.
Too bad this interesting development seems to be abandoned!