I support this idea and suggest that all of us could help. If each willing member extracts/identifies posts related to a single topic (as we would do when we do our searches, but a bit more thoroughly) and sorts them +/- per validation level, it would give a good starting point to the moderators to check and finalise.
Instead of a book I imagine it rather as a "Forum Index" linked to individual or groups of posts.
By providing links to the various topics sorted in logical order (similar to the Caesar's Technical Manual, or Course Notes) it would eventually save the moderators' time as it would provide a better search function.
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Regards
Ranka