Not quite sure of the purpose of the laser and laser redirection cube on the first floor because you can just shoot a portal up to the second story and get up their that way. Their is a glitch in your map on the second story. I just dropped the CC on the button and was able to jump up to the small ledge next to the stairs and just skirt around the stairs and up to the elevator. In the elevator room I solved all three rooms easily and opened up the door to the finish. Never found out what any of the pedestal buttons did. If they did something I never knew, and am quite sure they were not essential to me beating the course. The course looked nice though :D