Structure
One NXT:
Pictures and videos of the structure:
http://picasaweb.google.com/111903245762194124649/NXTStairClimberVer2Structure
Two NXTs:
One NXT:
Pictures and videos of the structure:
http://picasaweb.google.com/111903245762194124649/NXTStairClimberVer2Structure
Two NXTs: