vr,
My rack has a little bracket for a blinky, but it is too lightweight for what I have in mind. I have devised something out of 2"x1/8" aluminum bar that should do nicely. Still have to drill the mounting holes and attach it.

I have ridden the last 2-3 days in a constant light rain, and everything is holding up nicely. I mounted the headlight and the toggle switch with boot on the bracket I made. It is working great. The switch is not totally sealed, but I did wrap a piece of innertube around it to keep spray off of it. Nothing can really get into any of the electricals.

Aesthetically, it doesn't look bad at all, though eventually I hope to refine it a bit. For now I am still experimenting with how the pieces go together. Once I am satisfied I will start finalizing the package as a whole, physically, electrically, and aesthetically. I promise to get a pic of the bracket, light, and switch as soon as I can.
Regards,
Raymond