TabScout.

Notice

first of all -- yes, this really is played on guitar. guitar one has a massive amount of fast digital delay (though the 'decaying echoes' part sounds like an analog delay set to infinite repeats; hence the decaying nature of the echoes). guitar two is tremolo picking through 100% wet reverb, to create the slowdive-esque orchestral sound.
i'm not 100% on the bass notes in the interlude, but it's as best as i could make out. email me if you figure it out -- space_monkey_tuesday@hotmail.com