Driving with Databases: Book-level

I have a couple of potential applications for database-driven content. Simple one first:

It's obvious that the Southern Harmony is DB-driven. Someone had approached me with page images for another early-19th-century shape-note hymnal. It looks to me as if one additional column in the SH DB (something like "hymnal" = "SoHrm1930") would allow that whole smooth and pleasant interface to support multiple books. And a second new column would allow the page scans to be accessed from the electronic indexes.

Could that be opened up to the tweaks necessary?