The staves required a dowel hole on the bottom to align with the corresponding holes in the base.   These will not be glued joints.  Instead, I'll use some brass pins (adding a little weight at base level) to align the pieces, which will ultimately be held in place by the nuts on the threaded lamp pipe.

I picked-up a used Pantorouter a few months back, and haven't had a chance to use it until now.  It was perfect for drilling the holes in the bottom of the stave feet.

With an hour or so of sanding on the staves (and a little refinement of the shape), I was ready to join the staves.   To ensure that the staves were glued together in perfect alignment to each other (so that the lamp would stand vertically), I put a reference mark at the same height on each (at 6"), allowing me to align adjacent staves during glue-up.

I dry fit them together just to confirm the alignment all around.

The top-most triangular core I had cut out of end grain cherry to try to make it as inconspicuous as possible.  It will be glued slightly proud in order to provide a flat surface for the lamp pipe fasteners to press against.  If I were doing this again, I would probably alter the stave curve in that area to allow the core piece to mount flush.  Or maybe just carve out a bit on the stave locally to make a flat.  That didn't occur to me until after the glue-up.

Prepping for glue-up.   I should have grabbed the bottle of TB Extend because the TBIII was starting to tack-up as I was assembling.  It was a mildly stressful glue-up.
I started by gluing the triangular core pieces into one of the staves and making sure they were all packed together and seated evenly.  This was the only

Once the core was glued-in, I applied glue to both mating surfaces and pressed-on the 2nd stave, ensuring proper alignment of the reference marks (on the underside in this pic, so not visible).

The 3rd stave went the same way, and then I was frantically trying to clamp things up.  I thought I could get away with using plastic stretch wrap to clamp the staves together.   Unfortunately, the tacking TB III needed more persuasion, so I used a series of squeeze clamps, trying to balance the pressure on adjacent staves to keep them properly aligned and pressed against the core.  I was sweating bullets here, but it worked out fine.  The holes in the stave feet aligned with the pins in the base, so that was a good sign.

Next, I'll finalize the details for the lamp hardware.