Thanks for the great replies.

I started all over, and built up a spoke at a time. But, again, half the spokes on each side are pretty tight, and half of them pretty loose (last two pics). Same as the first go-around, but not quite as bad. And, this is with all 32 nipples run in evenly, so that no threads currently show on the spokes.

I'm confident that the right side is done right, but the first spoke on the other side is where it gets a bit confusing. The jimlangley site describes a method for making the 17th spoke parallel to the 1st one, surrounding the valve hole, and I thought I was careful there.