I got the general idea from
here.
My rack uses a different method for attaching to the bars, mainly because of the geometry of my bike.
It's also made of aluminum instead of steel and most of the joints are glued as well as bolted.
I've been hauling quite a lot of stuff over the last couple of weeks and it hasn't shown any signs of disintegrating, yet
.
If you'd like some more detailed pictures just ask.