This stitch is actually quite easy once you get the rhythm of it. The hardest part, I think, is keeping all those dangling threads straight without tangling or sewing the wrong thread into the right hole. I had less of a problem with the tension on this than on my single-needle coptic bindings and the cover stays closed pretty well. Maybe I'm actually learning something here.
The cover is cut from a Scrabble board with the two raw edges bound with Japanese decorative masking tape in deep burgundy. The back is a piece of book board covered and lined with a pretty green paper. There are eight signatures of six sheets each of peach-colored text paper and the coptic stitch is done with deep maroon waxed linen thread.
There are a couple of small bungles in the stitching that I don't think you can see in the pix, but I understand now what I did wrong there so they won't happen again.
A good lesson, this one.