Unfortunately they can’t just 3D print up a thousand skilled stone masons, labor to haul the limestone from the quarry, and a few centuries to make it all happen.
GMTA - I was wondering how they might even teach those masonry skills to robots to recreate that workforce.
No problem with stone masons. There are guilds across France that have kept the old medieval building skills and techniques alive. Coupled with modern methods, materials, tools, and transportation, they can do the job much faster than their forebears could ever have dreamed.
All things considered, it's just another restoration project. Bureaucrats and infighting are about the only thing that can stop it from being completed before 2025.
That is correct. But I feel certain that they have computerized stone cutters/grinders that will cut each individual stone to perfection much faster than a stone mason could.
The stone...
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...is still there.
They do need some lumber. And/or steel.
Good thing none of the stone work appears to have been materially damaged then. All the damage was confined to the wooden timbered roof which was covered by lead/tin alloy sheathing. The stone groins below the wooden timbers were uninsured. It’s a matter of rebuilding the roof supports out of modern either wooden or metal engineered prestressed trusses, and then re-roofing with modern materials, then rebuilding the spire that was replaced in the mid 1880s with one not made from flammable materials. Stone masons would have little to do with it except for minor repair/restoration that already needed to be done.
Thanks be to Him that the stone traceries and glass of the Rose windows escaped damage. That kind of stone work would take decades to reproduce...if such artisans even exist.