This is the main part and not the sort of chorus, HitchHiker's Guide bit.
The HitchHiker's Guide movie-version has a variation on the 6-4-3-1 bit which goes like this--
And then a variation on the 5-3-2-1 which goes like this --
The strumming bit is muted in parts but is basically Am, Am7, D7, F
, played with the
on the 3rd fret (Cm, Cm7, etc...)
So, that's about it. This is my first tab. Thanks.