a "real" invasion map

a "real" invasion would have all the enemies coming from outside to the inside. is there a way to make all the enemy spawns be one one side and all the friendly spawns on another side. then it would be like a "real invasion" because they are trying to get to the other side of you where they are trying to "invade". can someone make a custom map like that?

There are mods out there that do that.
They are complete rewrites of the invasion game type.
http://fraghouse.beyondunreal.com/ut2004work.php

any chance we could get one or 2 of those type of maps on our server?

It wont do any good. They will only work with that game type.
The mod is not compatible with Mystial's RPG or Druid's.