Well...they're a week or two late but here they are! Pics of my "Geekiness" headlight in final form. You can click on the pics to see a larger version.

On the rack, that's the 10ah SLA battery covered by a small canoe dry bag I had. Under the cover is the 5amp mini fuse. It's held to the rack using two 1" nylon webbing straps on a no-slip pad. The wires are inside a 1/4" loom, the switch box is silicone sealed (not the prettiest), the switch has a waterproof boot on it. The connection from the switchbox to the light itself uses a weatherproof trailer connector. She rocks 37.5watts for 2.5~3 hours...beyond that...I don't know, haven't had to run it that long!