I think this would be a great starting point for a redone version of the walkthrough. The fact is, the current walkthrough is a mess. A day-by-day guide is much less important than having a step-by-step guide for each girl. This would also lend itself much better to incremental updates with each new version of the game.
I realize that whole "reading" thing is a lost art these days, but perhaps you should skim through the first page on the guide where it says "index". At the very bottom there's a part that says "Scenes" with a quick search function code. You use that, or you know, scroll to the bottom of the guide where the "Scenes" section is located and it lists every scene available for every character, assuming there is one, and how to "unlock" it if there's something more involved than "go see her".
The guide is comprehensive, it includes the day-to-day thing for the first month because some people might want that.
All that said, nice work on the spreadsheet thing, both the original and the googledocs one.