Laying out my Rogue Trader plotlines

I was recently watching a video by Ander Wood on youtube regarding how to handle plots in games:

http://youtu.be/meLrlKTDXOY

Whilst watching the video it occurred to me that there may be a better way of noting down the various plots and storylines that I have running throughout my Rogue Trader FATE core game.

I have adapted my Imperial Calendar spreadsheet to also contain a sheet where I can note down the various events and upcoming events that are to occur in my plot; please note that, because some of my players read this blog, I have blanked out everything after the current game date and have blacked out some of the more sensitive information, you should be able to get the general idea though.

Comments/suggestions welcome :)

You can find the spreadsheet here:
https://docs.google.com/file/d/0B3N7nFBlEi_7MU1aTHFmc3dySEE/edit?usp=sharing

(please note that the spreadsheet layout is a bit messes up in the Google preview, if you download a copy though it should look much better).