After some debugging, I've got the last-custodian and no-custodian-t3 versions of the spreadsheets working (I think -- Jenkins is running now), and I've mapped out how the third variant should work. That third variant, as it's currently specified, makes no sense at all to me, though, so I've written to JSR to get some clarification before I put in the considerable amount of work necessary to create it. Meanwhile I can work on the new titles spreadsheet.