Concept Ring with compartment for Electronics

So here is a CAD drawing I did in OpenSCAD of a concept for a ring with a screw-on top.
the top has a hole in it for an LED.
There is a side hole in the ring for a mini-usb connector. That needs to be shaped a little more but good enough for now.
Note the top has a cavity to increase the payload space.
To think about the size of this, the ring will screw onto a 2-litre pop bottle like a bottle top.
so vertically large, but we can overcome that later when we physically prototype.