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Circular sprang - this is one continuous loop; the white cloth is in there to help keep me less confused.
It's one continuous loop, and the shed is worked in the front; after that, the lower crossings are pushed to the back and up. That's also why you see so many sticks stuck in my work:
Each of the dowels holds one shed that is waiting to be carried to the back. And here's a closeup of the fabric:
There's still quite a lot of warp to do, but I'm already looking forward to the point where work has progessed so far that I can move the whole shebang, bringing both ends of the worked fabric part to the front. No more carrying the shed around the lower edge! That will be bliss!