I'm still trying to get a handle on exactly how this works...it sounds very interesting. Could another few hours be saved if one could figure out how to make an elliptically curved hot wire cutter?

One concern I would have is that the rapid proliferation of CAD software and NC machinery will somewhat decrease the impact of such a technique in the next few years. But that takes nothing away from the elegance of the technique, nor its relevance to folks who don't have Shopbots all over town...