Anyway, we are trying to push our house toward a Craftsman Bunglow style with every project and for the basement project I relied heavily on a great book by Bob Lang. It's called Shop Drawings for Craftsman Interiors and it has great details on Stickley designs for door & window casing, base moldings, and all sorts of built-ins. I looked through it the other day to see how stair handrail was treated, and played with some options in SketchUp.
Of these, I like the one on the far right the best.
Making this in the shop will be a bit of a challenge. The total length will be about 15 ft, so it's not practical to send the rail through a machine. I'm looking at handheld router work mostly. That top curve will be a challenge also because of the large diameter of the curve. Regular roundover bits are too small and so I'm likely going to have to come up with a jig of some sort.
In the meantime, I printed a template from SketchUp in actual size. Next step is to take this into the shop and work up a jig.