Riff 1
|--------------------------------------------------|
|--------------------------------------------------|
|--------------------------------------------------|
|--7--5-----7--5-----7--5--7--5-----7--5-----7--5--|
|--------0--------0--------------0--------0--------|
|--------------------------------------------------|
Riff 1b
|--------------------------------------------------|
|--------------------------------------------------|
|--------------------------------------------------|
|--9\\7-----9\\7-----9\\7--9\\7-----9\\7-----9\\7--|
|--7\\5--0--7\\5--0--7\\5--7\\5--0--7\\5--0--7\\5--|
|--------------------------------------------------|

Bridge
|--------------------------------------------------|
|--------------------------------------------------|
|--------------------------------------------------|
|--9-----------8-----------7-----------------------|
|--7-----------6-----------5-----------3b----------|
|--------------------------------------------------|

Main
|--------------------------------------------------|
|--------------------------------------------------|
|--2--------7~~~-----------2--------7-b8-r7--5-----|
|--2--------7~~~-----------2--------7-b8-r7--5-----|
|--0--------5~~~-----------0--------5-b6-r5--3-p0--|
|--------------------------------------------------|

Riff 2
|--------------------------------------------------|
|--------------------------------------------------|
|--5-----------------------------------------------|
|-----7--7--7--7~~~--7--7--5--7--7--7--7~~~--7--7--|
|--------------------------------------------------|
|--------------------------------------------------|
Riff 2b
|--------------------------------------------------|
|--------------------------------------------------|
|--5----------------------------------/8--7--5-----|
|-----7--7--7--7~~~--7--7--5--7--7--7-----------7--|
|--------------------------------------------------|
|--------------------------------------------------|

RIFF 2 (chords)
|--------------------------------------------------|
|--------------------------------------------------|
|--------------2~----------------------2~----------|
|-----2--2--2--2~----2--2-----2--2--2--2~----2--2--|
|--3--0--0--0--0-----0--0-----0--0--0--0-----0--0--|
|--------------------------3-----------------------|
RIFF 2B (chords)
|--------------------------------------------------|
|--------------------------------------------------|
|--------------2~----------------------------------|
|-----2--2--2--2~----2--2-----2--2--2-/8--7--5-----|
|--3--0--0--0--0-----0--0-----0--0--0-/6--5--3-p0--|
|--------------------------3-----------------------|



As far as structure, I tried to simplify riff structure as much as possible.  
Some of the later "bass" sections are mirrored or complimented by the guitar, it's difficult to
discern which ones.

Riff 1  x8
Riff 1b x4
Riff 1  x4
Bridge  x1
Main    x4
 (bass) (x1)
Riff 1  x4
bridge  x1
Main    x4
Riff 2  x4
RIFF 2  x10
Bridge  x1
Main    x4
 (bass) (x2)
shred   x8
 (bass) (x4)
Riff 2  x4
RIFF 2  x2
 fade