Call ACIW
http://www.aciw.net/articles/view/4
I bought one from them for my Ram a few years ago. It was great quality at a great price. I think it would be quite a bit of work to make one like these. What I really liked was the cage was square stock welded diamond wise and brake and cargo lights. I was really happy with it.
It seems like all/most of the nice headache racks are made in Texas. There are no companies in Calif that make them, and we only have one bumper company Reunel, and I had one of those a couple trucks ago. Headache racks are a smart safety component if you do a lot of highway driving with loose equipment in the bed.... hit something and your head is the target.