Yes, I want to know more abou the mod for SH2, also.  I started doing some of the training missions in SH2 but didn't get very far with it.
"Silent Hunter: Commander's Edition" totally rocks, even by today's graphics standards.  The gameplay in that one keeps bringing me back.
If only I could find a decent scale model of the Gato boat....   I built the Revell/Monogram "Lionfish" (great hull, crappy guns and conning tower).  Ok, off to surf to see if Tamiya makes a US sub kit.