This brings back memories, found this site 20 years ago when I dreamed of building a pipe organ. My dreams were more ambitious and I used to spend a good number of hours scouring ebay for used pipes and researching and dreaming, got myself a copy of The Art of Organ Building and drew lots of plans. Eventually I realized the sort of organ I would need to be happy was beyond my means and ambitions but it was a fun dream.

The organ which inspired my dreams: https://jehanalain.ch/orgue/

Edit: The Alain Organ, not the Tagliavini, did not check the link closely enough and missed it covered two organs.