FYI bookbinding is my family business. I know several professional bookbinders. It's not an easy skill to obtain practical advice and instruction in, so if you ever want me to put you in contact with anyone, I'd be happy to. Have no idea of this is something you're interested in, so just disregard if not. Tried to send this as PM but kept getting 502 error.
Edit: just got a 502 here, as well, and it went through, so probably I blew up your inbox with the same message 4 times. Sorry!