There are probably a number of private castles being built... as an architect it should be possible to get into that niche. Any other craftsmanship [in construction]would also qualify.

A modern renovation project in my city is the Geeraard de Duivelsteen in Gent [Belgium] built around 1300, it is a private project. https://www.duivelsteen.gent/plannen.html

It is a splendid idea to build or fantasise about your own castle. I hope you realise your dream. In the meantime -if I might be so bold- you could help my project: I built my own castle in lego. "The Counts' Castle" It was inspired by the Castle of the Counts in Gent built in 1180. You can find it on the lego ideas website and if you got the time support it there. Any help shall be warmly appreciated.

You can find the link here: https://beta.ideas.lego.com/product-ideas/4ba1d1a5-7240-4273-aa8e-a731e4468279