Since the pipe organ will be inevitably mentioned in the comments, I'm gonna plug the Youtube channel ‘Look Mum No Computer’, whose gear-crazy author in now apparently in the final stages of installing and patching up an organ in his seemingly interminable basement, after moving it from someone else's house: https://youtube.com/shorts/XGL3rskcQD0

Said organ was built by its late owner not just in the house, but pretty much into the walls of the house, and as a result the thing had to be ripped out of there rather grotesquely, and then rewired again at the new place: https://youtube.com/watch?v=8PwwRR8deHk