This is just an attempt to understand MvM map and gameplay design. Included is a mission (Frozen Bolts), which you have to put into "team fortress 2/tf/scripts/population" (If you don't have a population folder, create one.) Load up the map, then open the console with ` and type "tf_mvm_popfile mvm_frozen_bolts". I have no idea how anything works with other players, since I've only had 1 person (me) on it at any time. I also have no idea if my mission works well at all, either.