It's played in 4/4 time signature and tempo of 112.5 bpm

Dallas starts off with a barre on 12, and then into...

d# | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 |
b  | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 |
e  | 7 6 7 6 7 6 7 6 | 7 6 7 6 7 6 7 6 | 7 6 7 6 7 6 7 6 | 7 6 7 6 7 6 7 6 |
D# | 5 5 5 5 5 5 5 5 | 5 5 5 5 5 5 5 5 | 5 5 5 5 5 5 5 5 | 5 5 5 5 5 5 5 5 |
B  | 4 4 4 4 4 4 4 4 | 4 4 4 4 4 4 4 4 | 0 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 0 |
E  | 4 4 4 4 4 4 4 4 | 4 4 4 4 4 4 4 4 | 0 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 0 |

this is the main riff for the verses and chorus. The strumming seems to be just 
 strumming through it more to hit the top strings on the off-beats.

repeat this 6 times, the last time playing the upbeat to the next riff...

d# ...0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
b  ...0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
e  ...1111| 11- 7 7 7 - 7 7 - 1111| 11- 7 7 7 - 7 7-|
D# ...1010| 10- 5 5 5 - 5 5 - 1010| 10- 5 5 5 - 5 5-|
B  ...9 9 | 9 - 4 4 4 - 4 4 - 9 9 | 9 - 4 4 4 - 4 4
E  ...9 9 | 9 - 4 4 4 - 4 4 - 9 9 | 9 - 4 4 4 - 4 4

use dud, dud, dd as the strumming pattern to get the quick triplets and slower quavers,

d# 0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
b  0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
e  9 9 | 9 - 7 7 7 - 7 7 - 9 9 | 9 - 7 7 7 - 7 7
D# 8 8 | 8 - 5 5 5 - 5 5 - 8 8 | 8 - 5 5 5 - 5 5
B  7 7 | 7 - 0 0 0 - 0 0 - 7 7 | 7 - 0 0 0 - 0 0
E  7 7 | 7 - 0 0 0 - 0 0 - 7 7 | 7 - 0 0 0 - 0 0

This is repeated 4 times (16 bars), and then returns to...

d# | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 |
b  | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 | - - 0 0 - - 0 0 |
e  | 7 6 7 6 7 6 7 6 | 7 6 7 6 7 6 7 6 | 7 6 7 6 7 6 7 6 | 7 6 7 6 7 6 7 6 |
D# | 5 5 5 5 5 5 5 5 | 5 5 5 5 5 5 5 5 | 5 5 5 5 5 5 5 5 | 5 5 5 5 5 5 5 5 |
B  | 4 4 4 4 4 4 4 4 | 4 4 4 4 4 4 4 4 | 0 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 0 |
E  | 4 4 4 4 4 4 4 4 | 4 4 4 4 4 4 4 4 | 0 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 0 |

for another 2 repeats (8 bars)


The bridge varies on his album and live versions,
The album version is simply the one chord...

d# - 0 -
b  - 0 -
e  - 7 -
D# - 5 -
B  - 4 -
E  - 4 -

and on the live version he alternates between the two chords....

d# - 0 - 0 -
b  - 0 - 0 -
e  - 7 - 7 -
D# - 5 - 5 -
B  - 4 - 0 -
E  - 4 - 0 -

either way, palm mute the top strings and repated for the duration of 8 bars,

then into the 2nd riff again...

d# 0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
b  0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
e  1111| 11- 7 7 7 - 7 7 - 1111| 11- 7 7 7 - 7 7-|
D# 1010| 10- 5 5 5 - 5 5 - 1010| 10- 5 5 5 - 5 5-|
B  9 9 | 9 - 4 4 4 - 4 4 - 9 9 | 9 - 4 4 4 - 4 4
E  9 9 | 9 - 4 4 4 - 4 4 - 9 9 | 9 - 4 4 4 - 4 4


d# 0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
b  0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
e  9 9 | 9 - 7 7 7 - 7 7 - 9 9 | 9 - 7 7 7 - 7 7
D# 8 8 | 8 - 5 5 5 - 5 5 - 8 8 | 8 - 5 5 5 - 5 5
B  7 7 | 7 - 0 0 0 - 0 0 - 7 7 | 7 - 0 0 0 - 0 0
E  7 7 | 7 - 0 0 0 - 0 0 - 7 7 | 7 - 0 0 0 - 0 0

Which is repeated 4 times and finally...


d# 0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
b  0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
e  7 7 | 7 - 7 7 7 - 7 7 - 7 7 | 4 - 4 4 4 - 4 4
D# 5 5 | 5 - 5 5 5 - 5 5 - 5 5 | 3 - 3 3 3 - 3 3
B  4 4 | 4 - 4 4 4 - 4 4 - 4 4 | 2 - 2 2 2 - 2 2
E  4 4 | 4 - 4 4 4 - 4 4 - 4 4 | 2 - 2 2 2 - 2 2

d# 0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
b  0 0 | 0 - 0 0 0 - 0 0 - 0 0 | 0 - 0 0 0 - 0 0
e  4 4 | 0 - 0 0 0 - 0 0 - 0 0 | 9 - 9 9 9 - 9 9
D# 3 3 | 3 - 3 3 3 - 3 3 - 3 3 | 8 - 8 8 8 - 8 8
B  2 2 | 0 - 0 0 0 - 0 0 - 0 0 | 7 - 7 7 7 - 7 7
E  2 2 | 0 - 0 0 0 - 0 0 - 0 0 | 7 - 7 7 7 - 7 7

which is repeated 4 times and then back to the root chord again:

d# - 0 -              - 12~-------------|
b  - 0 -              - 12~-------------|
e  - 7 -  repeated until the end  - 12~-|
D# - 5 -              - 12~-------------|
B  - 4 -              - 12~-------------|
E  - 4 -              - 12~-------------|


well, i'm almost certain most of it's correct! it looks the same on the fingerboard to 

riff might be different to the album version, bit it's hard to tell with the cello over the top.

Hope that's a help, and what a cool tune!