Thanks for your interest in project!
Looks like the real goal of getting to multiplayer isn't going to happen.
I have v1.9.1 A barebones single player for sub against unprotected convoy.
It's available on the www.subchase.com website.
o random Convoy generator
o time compression for speeding up chasing down a Convoy
o two modes : VIP / Merchant
o torpedoes tracked on Navigation Map
o numerous bug fixes
o numerous usability improvements.
o no graphical improvements.