http://www.theatlantic.com/infocus/2...rebels/100461/
Turns out you can improvise the rest. I don't think there is a lot here than hasn't been done elsewhere. Maybe orienting tubes with an Iphone or using a PS controller to control a turret.
When do you think the related PS game will be coming out for that one?
The trebuchet is a bit odd. The use of a ?wheel? instead of a straight arm on the weight may increase power significantly though. Seems to me like their ratios are off a bit though.