and something a bit more recent:
This is a photo of my unfinished boss kit that I made myself, I am currently using it and the only thing it needs is a peice of 3.5 inch pipe to be welded on as a shroud to hide the horn holes, cables, etc... Since the photo was taken I have since wired the horn in and obviously attached the wheel. Notice the base where I am using the original (well a corolla original) plastic plate with the brass ring, this is to keep the horn running. To make this I chopped the center out of my old Corolla wheel and machined it down in the lathe at work when no-one was looking, welded a peice of pipe, made my eloborate flange and welded that on. When I get that 3.5 inch pipe i will take it off again and weld that on. In the meantime however it works great, would be almost indestructable while still being very light and still lets the horn work. I know this is an unsual thing to make but it has worked out well so far and besides I made this during a few quiet times at my work