Since you said space for an always war, and I guess since I've mentioned OCCs, I felt reminded of the thread which had ideas for the most difficult game imaginable. The following probably wouldn't come out that difficult, but it might make things interesting. OCC Always War, all victory conditions enabled, but only acceptable victory condition comes as space, no trading whatsoever... we don't even open the trading screen, pangea (continents might work too, but a continent could lack uranium, aluminum, or rubber), no Great Library either, and I'd suggest The Spanish at Chieftian, Warlord, or Regent.