DISCLAIMER:
Read my profile before reading the rest of my comment!

Only one cube is ever needed to finish this map. A cube acts as a good turret shield. Didn't need to disable the laser field. No fling pit necessary because of advanced fling maneuvers. You can get trapped if you forget to take a cube with you to activate the exit.

Try my SP map?
http://www.cs2bus.com/sharedfiles/filedetails?id=377129237
Try my COOP map?
http://www.cs2bus.com/sharedfiles/filedetails?id=376181211