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A few things regarding the performance/notation of this piece:
Ringing notes: I tried to use ties, let ring lines, and high/low melody where each would work best. Sometimes a note within a let ring might get muted, and there are plenty of notes that ring out longer than their rhythmic value where I didn't choose to put a let ring line, but overall the tab should give a good idea of when a single note sustains into the next, when to hold a chord shape to let notes ring, etc.
Arpeggiated chords: When I put an arpeggiated chord with the last note separate from the arrowed arpeggio and a pickstroke indicator underneath (like in bars 4 and 5), it just means to strum through the chord at the right speed so the last note ends up being right on the beat. It won't always sound perfect during playback because Powertab will play the first notes too quickly and the last one ends up detatched, but this was the best way I could think of to notate it.
Chord names: The chords in parentheses mean an incomplete/implied chord, the overall tonality of a section, or a chord with additional tones or bass notes that might change but somewhere in there is the basic chord throughout. Section B is probably the most interesting string of arpeggiated chords in the song, changing on every beat, and I listed as many names as I could here.
Fingerstyle technique: Often you can find a pattern of notes that the thumb will end up playing as 8th notes, such as in section E at bar 73 (thumb alternates between a low E and its octave E for the first 4 notes that fall on the 8th note beat). That's about the simplest explanation I could give to make sense of some of the parts that look like random notes all over the place, from there it should be a little easier to see the pattern/melody the other notes form once you work out what to play w/ thumb.
Ghost notes: I used a lot of them. In all cases, they're quieter than the rest of the notes but usually still important to the feel/sound of the song, and most of the time they bring the benefit of indicating whether certain notes are a downstroke w/ thumb or an upstroke w/ finger(s). For example, in bars 70-72, the ghost notes give away an alternating thumb/finger pattern, with the finger playing all the open high E's, and all the ghost notes are hit on the followthrough (thumb hits G string, brushes B slightly, finger hits high E then brushes B, etc.). That should be pretty obvious in this part but it might help when learning another part with an odd ghost note here and there.