There is a Cataclysm tree for associated tools and documentation (svn://www.homeworldsdl.org:3692/homewor ... lysm/trunk
) but not for recreating the game itself. There would be a fair bit of work involved to support the original gameplay (beast infection; new ship behaviour; forcefields; crystals) as well as recreating the missions from scratch too. It can be done but personally I was waiting for the source code to be released to make it easier! However, that was a remote possibility to begin with and if they were going to release the Cataclysm source code I think they would have done it by now. Rather than fork the project, I think it would be better to enhance the Homeworld source to improve its modding capabilities and then construct a Cataclysm campaign on top of that.