a special spell is a major goal in your story - or just a few pages of
text, then having your gamers find it in a massive volume assembled by
an “Otherworldly Secret Order Shrouded in Mystery”
etc. might be just the ticket. ( especially if the lighting is right ).
It’s not by any means a "quick and dirty" prop, but the dramatic impact
of exagerated scale could just make the role play more fun, and
definitely more memorable!
Some methods used to make these books can be applied to other projects as well. I would be curious to see other attempts at massive books, particularly if the inner blocks were replaced with “Foamcore” pages. That would keep
them light enough to move easily and make them more functional!