Completely Hidden Full Bookshelf Setup in Minecraft Java | Redstone Tutorial

I wanted to make an enchanting table setup where the bookshelves could be completely hidden, flush with the ground. I couldn't find any tutorials, Reddit said it was too hard. I had many Redstone feats to overcome. I knew it was possible, so I did it. It's not perfect, but its a good prototype. Let me know if you see something that could be done better.

P.S. I coudn't really find a flush double-block extender either, so I kinda ended up making my own in the process, it's slow and kinda big, but it works

Songs:
Ready to Run - PaoloArgento
Advice - Oleskii Besalov
Memory Waves - Lico_
Natural Inspiration - ComaStudio