The reason that this did not work is that it's really the height of stupidity to want to build anything like this in the middle of a unstable region. The same rules apply all over the world - when people are shooting and you are getting pushed out of your home, you really don't want to be testing out new stuff. You want to survive, get some food, educate your children and so on.
It's easy to sit in a comfortable home in the U.S and see this as something that would be great for the people in Darfur, but they don't care about this. They just want some stability in their life, and bringing in new materials and things does not work at such times. They want to work with known quantities.
I find it really sad that there is so much that talented people with energy to spend can do to help so much of the world, and they instead choose to expend their energy on the topics that are being hyped by the newspapers. Such a system would have worked excellently in Kenya or Congo or one of the dusty countries of middle asia, why even consider Darfur for this?
One should not see a charity as a fashion statement or a networking tool, one should spend money and time on things that actually matter and make a difference. Not things that are currently trendy, and which one can excitedly tell friends about.