Yeah that's what I'm planning on doing Earendil, Me and Persia have almost eliminated Zulu right now and next turn I'm going to ask for peace with Zulu throwing in a couple of techs (I know he'll do that with some gold from me) my next step is going to be to protect myself from Persia, I still have an MPP with him so after Zulu is gone I"m going to get my workers going making a double square deep of fortress's (Maginot line if you will) along our common border. I've used this tactic before and it seems when the AI breaches the line they dno't seem to bust through and raise havoc, what they do is continue to attack my units fortifying the line (stupid AI) this should give me enough of an advantage to take him on with my Arty and infantry since I'm on the verge of replaceable parts.
You are right about Persia though, they are backstabbers and that's why I made the MPP with them many, many years ago. I have turned space race off and I don't think I"ll get a Cultural victory. I may be able to pull off a Diplo victory since my Rep is still spotless, but I think the most feasable would be Domination victory