I had forgotten that at the far end of the left-er bed is a large underground rock about 2 inches down. So the left one needs to be two courses deep and I pushed and hauled and grunted the thing together yesterday. I'll need to check the ground in the right one, I may leave it at one deep - or may make it two deep if I find another huge rock in there. They are level to about 4 inches over 12 feet, which I hear is good enough.
Next question: I've read that I should be using hardware cloth at the bottom of these to prevent burrowing animals from getting in. Opinions anyone?
See how nice and smoothly graded the orchard area is on this frosty morning? I spread grass seed yesterday, so it's possible that I just doubled the area of grass I have to cut (oof!).