Hello,
I'm able to help you sort 15,000 ebooks in Excel and also placing their links in Excel so that when the designer open the file they can easily see the details, category of the book and the link to the file. Since I know my way around Excel, it's a simple task for me and I'm confident in delivering the work as per your requirements.
As a matter of fact, for your consideration, I'll be happy to make a sample sheet with 20-30 books, all categorized and linked to Google Drive. We'll only proceed if you are satisfied with the sample :)
Looking forward to hearing from you.