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$100 billion for a high-tech structure of 1000km in size? I think you're severely underestimating.

It's a ring, so it should be thought of as something pi1000km in length, not pi(500km)^2 in area. The inside of the ring is not used for the structure. $32,000/meter sounds pretty generous.

LHC is 27km long and cost $4.75 billion.

Which is around $175,900 per meter.

That's a good reference point. Cost for infrastructure projects usually isn't linear. I've seen an exponent of .6 used to extrapolate costs.

(3140km/27km)^.6 * $4.75B = $82B. Adjusting for inflation gives you something a bit over the $100B. They probably came up with the number in a similar fashion.

Do you know if your number includes the detectors? They would have contributed significantly to the total cost.

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