I think your biggest issue is going to be meeting the requirements for a bashing weapon with a spell book. I picture both length and striking surface issues.
Thought about this too. Conceivably, you could make it within the specs of a thrown weapon. No core, all foam and coating. And I think it might also be useable for waylay. But I think... not 100% sure...to make it a hand- combatable weapon, you'd have to have it on a stick with a core... Oddly I do imagine something like an ax. BOOK AX.
I was thinking what I would use it for. Mainly blocking. Perhaps the Buckler rules would apply. Although the option is nice I don't see my self hitting people. I'll have to look into it more.
this sounds like a project i'd like to try to make. unless you already made it and if so, i'd like to see pics. I'm pretty sure I'll be stopping by SF for the weekend in July 2016. PM me if you'd like to collaborate on it before that time.