I don't like to sound badly about this project, as there's a lot of stuff done to it without visible outside interpretation, but currently the next major milestone is getting someone to work on it again
The Server code works. Killing does not. There's no real gameplay, however, there are features already not accessible from Gang Garrison 2, such as proper interpolation, and prediction, but prediction's pretty broken, so nevermind that.
UDP networking works (obvs.), Holepunching (hosting without port forwarding) does not.