looking good my man...I used a bobcat with post hole auger when I did all mine...yeehaw
With a high salt content I would cut back the percentage of compost used, I never go over 20% anyways myself, but you may want too, or less as well.
MOB mOB MOB!
Did you use any sort of design/plan for the runoff trays or just one side higher than the other a bit?