I'm not trying to undermine but more just act as a reminder to some folk. There is no such thing as "just an engineering problem". These things do not exist in a vacuum. It is a part of the tripod of economics and politics. If any one of these three buckles, the whole thing doesn't happen. Concord was an engineering problem we solved, but the economics and politics around it made it a white elephant. Here's hoping this doesn't happen to this.