Skywalker 1:
Go to terr spawn 2. Now when you play control point there is an ladder you can climb up and an platform you stand on. It will be located in the far right corner. Climb up the ladder, go around the hole and face the ladder.

Take out your rocket
fall towards the ladder
keep hitting x to climb



Skywalker 2:
Go to terr spawn 1. Now there are an set of building to your right, go to the back building though the door and you will find an ladder. Do the same thing as skywalker 1 (noted above). Once you are skywalking.

lay down
crawl to the middle of the ceiling you should see it dip (right past the first wooden beam).
stand up
now start moving your guy around in circles
position your camera so you can see the roof.
you should start to see your guys shadow
your guy will get stuck
keep moving back and forth
your guy should teleport ontop of the roof.

If you master this it is an higher than you can get in skywalker 1 (above).