I think it could be a KSP-esque space race, a long-term game created by a player and hosted, and it would be something like Rockomax vs Jeb's Junkyard or Kerbodyne, with custom tech trees. There would be two launch sites, one for the KSC, and then another one on the other side of the planet, or 1/3s way around. The winner would be the first to do something, like a Mun mission or a Laythe manned return. Kind of like Civilization for KSP.