That would be amazing if you do it right, with a very good architect that specializes in these styles (I do but I'm still in school. But I can help with the design process if even for fun :)

My dream house is also an RC shear wall structure (earthquake country here), but in a simple French Classical instead - been working on the design for years and the plans are almost complete.

And yes! The resources, materials, and skill still exist. Here are some:

Architectural antiques and salvage

https://ogtstore.com/

https://feauboiseries.com/

https://www.marcmaison.com/

Hardware, plumbing, electric:

https://www.houseofantiquehardware.com/shop-by-type/vintage-lighting-electrical/light-switch-covers

https://www.remygarnier.fr/en/categorie/classique/

https://www.sherlewagner.com/

https://www.thewatermonopoly.com/

Metalwork:

https://www.lesmetallierschampenois.com/en/traditionnal-metal-work-and-blacksmithing/

Mosaic and Tile:

https://restorationtile.com/

Plasterwork:

https://bostonornament.com/blogs/portfolio

And/or

https://fraplaster.com/imagelibrary/ornamental/

Stonework:

http://www.dmsstudios.com/ExteriorLimestoneandMarble.html

Windows: (Historically accurate)

https://hopeswindows.com/products/historic-landmarks/

Woodwork:

https://agrellcarving.com/showcase/

https://wideplankflooring.com/our-floors/patterned-floors/

As you can see, it wouldn't be cheap. But it would be amazing. I'd rather have a smaller, beautiful and perfect house than more room than I can beautifully furnish. Good luck!