Main rhythm based 'loosely' on Crushing Day with the rhythm accents falling frequently on the 4+ and 1+.
This is also slower so us mere mortals can play along - 130bpm with Crushing Day being around 164bpm.
There's also a nice slow middle 8 section for you to play around with.
'Section A' - based around Gm7, G7sus4, then Am7, A7sus4 with added accents of F/A.
'Section B' - Dsus4, Dm7, D5, Dm7 'Middle 8' - Dm7/A, Am7
Some Possible Scale Choices for Section A
G minor pentatonic
G Dorian Mode
For Section B
D minor pentatonic
D natural minor
D Dorian
D Phrygian
Basically for this section you have a lot of freedom given that the tonal centre hangs on D so much and has some 5 and suspended chords which are neither major nor minor. This means you can even experiment with major scales over those chords.
Whatever you do, have fun!