Watch the 1 5 b7 Structures online guitar lesson by Brad Carlton from Guitar Lab: Open String Universe
This lesson uses a root fifth flat seventh structure on the 6th, 5th and 4th strings combined with the 3rd, 2nd and 1st strings open.
Voicing 1 is a B b13b9b5(no 3) voiced 1 5 b7 13 b9 b5. Use the half-whole diminished scale for this chord. Voicing 2 is a D13sus4 voiced 1 5 b7 4 13 9. Mixolydian and dorian fit this chord.