“Do we still have access to all of the specialized knowledge that went into that building? E.g., stone masonry, wood carving, preparation of varnishes, etc.? An

“Do we still have access to all of the specialized knowledge that went into that building? E.g., stone masonry, wood carving, preparation of varnishes, etc.? And is there enough supply of the required building/decorating materials? ” France has dozens of cathedrals being restored at any given time (don’t forget that we have 1000x more old buildings than the number foreign tourists go to :-) ), restorations that often take 5-10 years. I wouldn’t be too worried about not having the skill set.