Although this thread has not been used for 8 ,eight, 8 years most of these mods will have conflicts with the sh4 1.4 version and most definitely with U Boat expansion 1.5 version!
This is a list to pan over of current mods and tech help.
http://www.subsim.com/radioroom/showthread.php?t=155786
Hope this helps you.
Fithah4