Line the inside of the medium bowl and outside of the small bowl with reflective tape and bond them together
Glue the drain fitting on the lip of the small bowl
If you want to attach the ring to your camera for hands free shooting, glue the appropriate hood on the inner lip of the drain fitting
Fashion a disposable cutting board to the outside of the entire ring if you would like a bit of diffusion
Attach the lens hood to your camera and enjoy your new device
note: With very little frugality I was able to complete this entire system for $13, the largest cost being the drain fitting.