if you love the s-boats then you should like this mod i did for them, its an attempt at realism to make them as fragile and limited as they were in real life.
for skins i just dirtied them up and added some rust so you might want a different look but the mod should be very much to your liking
find it here:
http://www.subsim.com/radioroom/showthread.php?t=157608