I was the original creator of the liberty city conversion. I joined redspikes mod understanding that they had a multiplayer component ready for me to stick the maps into. Also programs which they lied about that could switch between two IMG archives.
But all the promises were soon figured to be lies and I left the team and gave the source to two different parties, one of which closed their doors back in 2004.
The other team has completed a version and another on the way with missions. No online as the team was not going for that game play.
A link to the forums can be found below.
Gtaforums.com
If you check the forums my partner RDTG has created an XBOX port.
I have since given up GTA modding and the project lays in the hands of the new GTA:LC team.