Guitar Question- Say Goodbye

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Has anybody figured out the chords yet for Say Goodbye (or anything remotely guitar like with it)? I played around with it for a brief period of time last night, and I think it starts with alternating C and C7 chords, but I'm not sure... also, I have a hunch that he might be using something of a different tuning; maybe drop-d or dadgbd tuning? Anyone have any ideas??

I hope you all can help, because I'd really like to play this song.

Thanks all,

Adam R.

PS: I think it would be cool if all of us Fleetwood Mac guitar players were to start a web page that we all do together of guitar tabs and chords, etc., as a big reference guide. What do you all think? AR