I cut cost overruns for things like this some slack because I know, irrefutably, that anyone who thinks they can estimate a budget for a one-of-one, never-been-

I cut cost overruns for things like this some slack because I know, irrefutably, that anyone who thinks they can estimate a budget for a one-of-one, never-been-done-before, object like Euclid is a liar. I know all about the techniques. I've been in the meetings. I've seen the spreadsheets. Your parametric cost model is adorable. But at the end of the day, you're just lying with math. And if you have to lie a little bit to get a space telescope built... no sweat.