Great work. Nicely timed too, I've just uploaded a Das Boot Theme Music mod to replace the default in-game and menu music if you want the full-on Das Boot experience.
It ought to be available at
http://u-boot.realsimulation.com/ probably by the time you read this. File name is 'Das Boot Theme Musicpack.rar'...and yes, it's JSGME ready.
What with your movie mod, the DB speech mods, DB loading screens, DB Officers mod and this Musicpack, all you need now is for someone to throw a couple of buckets of salt water at you whilst playing SH3, and you'd swear you really were on the bridge of the U-96.