I would recommend that you start focusing on one thing only, and then try to do it propetly. Spreading around too early killed many similar project.
So for start, go with custom battle mode only. Battlefiled, some units, some factions, game physics. After that, start working on AI for it (or maybe MP mode, whichever is easier to you).
Then after all its over, and looks good, start to think about campaign.
Too much thinking and too little doing killed many open source projects (large design document draft and very little code).
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