This may not sound like a modelling topic but you'll see. In 1985, my wife built three bookcases for our den.
About 10 years later we made two wider ,deeper ones for the other wall.
In 1999, we moved and we lined them all up against one wall in the new house.
In 2005 we moved here. Last year we decided to restore them and make them fit two opposite walls of the guest bedroom. That meant narrowing, sectioning to get them to the same depth and the required widths to fit that particular room.
With all this cutting and everything we ended up with not enough long shelves and it left a big hole. Well, that is where the models are going. I've made a set of shallow shelves and I'll be able to stack maybe 5 of them in that opening. Then I'll look at making some glass doors to keep the dust out.