Oh, my goodness, your library is beautiful, and so is the rest of your home. Wow.
It took 2 years and 2 crews to finish the library. I sanded and prepared every board until 3 or 4 in the morning before they arrived, and invented many of the techniques for handling soft lumber. Then the crew would put them on the walls. When I had a particularly great board, they’d slice them down the vertical and we’d glue garbage onto them to make them 3/4”. Then I could do facing pieces. The closet doors had to be made since they were 10’ high and I couldn’t buy them easily. Those we laid out with a map. I still have a lumber room in the basement with boards I bought all over southern MA.