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All I can do is echo what many others have said, AWESOME!!! (both the pieces and the Instructable). My mind is reeling at what I can do with this combination! A Billion Thanks!!
You already received a lot of good answers, I thought I would interject that I use a hole saw to make the "V-Slot" (slightly smaller than the pipe if possible). Placing a board of appropriate thickness between the "jaw pieces" allows for a nice round pipe clamp. Also aerosol "Sticky Note" glue will assist with friction and leaves no residue on the pipe. I also use the aerosol sticky note glue to put cutting templates on the wood when cutting complex parts (gears w/spokes and such).