well done De! That was a fairly large undertaking.
Please take a photo when ya has those shelves with lots of books on them?
Congrats on the fine organization and carpentry skills!
I am not as ambitious as you so my book shelves consist of the Library shelf size ones in bookcases I purchased.
I do not have a basement due to the high water table from the natural spring toward the rear end of my back yard.
Hopefully ya has a decent Table Saw with large table supports ?
Looking good so far De! Can't wait to see the conclusion of it!