In reply to Shaun adams:
ok cool.
Personally, I strongly dislike via Ferratas, the main reason being that the subjective feeling of security is higher (strong cables, Iron, Big Grips) than the objective security (Baaad Falls, lack of spacing between climbers... ) thus leading some of people into trouble with a false sense of security.
But best of Luck to you anyway. If you do it for charity, I'd try to add a marketable angle like: do the whole thing by fair means from home (Bike, sailboat etc)... Or wearing a flack jacket...
(Sports climbing is the opposite, where the subjective feeling of security is much lower than the objective security, which is fairly high. In Mountaineering, the perceived risk is more in line with objective risk)