I posted some more pictures here:
http://blog.13amp.org/tech/my-tri-monitor-rackmount-pc.html
And a full write-up here when I built it last year:
http://www.silentpcreview.com/forums/viewtopic.php?p=353954
It's rubbish in lots of ways. Most notably, you can't click left and right buttons at the same time, and you can't click right without lifting your finger off the left. Other than that, it's very nice to use and I prefer the ball to a scroll wheel.