Btw...when you are building your ring segments with non-transparent areas inside your ring the following texture will be enough to display all the rings you will ever need.
You do not have to care about ring-width at all. Clever overlaying and frame-stacking is all you need to create the illusion.
Layer 1: (needs two scrollFrames of same color)
Handling ring-width is an annoying topic. If you don't have to fiddle with it just don't.
The last step is another layer ontop containing highlight/border textures. But I remommend to delay that step until the layout is finished. It is tedious to create it if you are still working on your layout and change sizes around all the time.
One thing I still need to check out is the effect of the different BlendModes.