There's a lot more scales for 7 string coming soon. I won't be going as crazy as I have for 6 string, but I'll probable cover The Penatatonic Scale, The Blues Scale, All the greek modes, and Harmonic and Melodic Minor and all their modes.
That should be enought to keep you going anyhow.
Before that though, here's THE DORIAN MODE MAPPED OUT FOR 7 STRING GUITAR.
CLICK HERE FOR OTHER RESOURCES FOR 7 STRING!!
The free guitar scale diagrams below lay out the DORIAN MODE for you all over the neck of the seven string guitar as a four note per string scale and as the seven three note per string patterns that will link together to let you play it all over the fretboard in any key.