Welcome.
I think that you'll find SH III far more enjoyable with GWX. While you can't visit the engine or torpedo rooms at least you get a "live" crew; unlike SH II. It always bugged me (in that game) when I'd see the deck gun fire with a ghost crew...
P.S. Here's a good reference to keep on hand:
http:////silent-hunter-addict.com/Qu...m_Members.html if you run into a problem. It'll save you from having to do a lot searching when you're looking for a solution.