Dyson spheres are a common topos in "hard" science fiction. They certainly would make sense in the MoO universe (which already has artificial planet consruction). However, MoO2 does not have them, so if the goal of this mod is to recreate the MoO2 universe in Civ4, then there shouldn't be Dyson Spheres. If, however, the goal of this mod is to recreate MoO2 and *add* to it, then Dyson Spheres would certainly make a natural fit. (Personally I don't really have a preference, but I think that sticking to MoO2 content for the time being would probably be the better course of action, one can always add new stuff later).