I started this last year and had it working on the bench but I never actually completed it. Finally I mounted the light and took some pictures. Basically I took a rubber drain pipe with a plug on one end and mr16 bulb on the other. I used left over seat reflectors and handle bar reflector brackets to attach it to the lamp.
I have a 12V 5AH led acid battery, I might try and mount this, but I should just go and order the water bottle battery pack.
Here are the pics.
P.S The tires are new, I just put em on and took em for a test drive right before snapping these pics. So far I love em. they are IRC smoothies.