The Aitheins are incredibly light. Anyone remember those aluminium superlight Pantani era Bianchis that invariably cracked?
Saw this on another forum. The square hole is basically the same as the ADF roof window on a de Havilland Comet, and is crap design. Also, Kinesis have form for this sort of thing. One of their forks killed someone a few years ago and they tried to recall all the similar ones.