I really like this!
The only thing I might do for my own purpose is to move the centers of the holes in the front rack together a bit so that all the rods are pointed to the center of the truck and not directly over my head (or the passenger's head). I sit pretty high in the seat and my head would be on those.
What keeps them in their hole when you're hard on the brakes? Will they tend to slide forward and end up in a pile? Or is that what the elastic bungee you're talking about would be for?
I know I answered on my other thread, but for consistency's sake as well =)
You can't really tell from the pics, but I did move the holes on the front rack in a bit to give it more of an angle in toward the front. I probably could have done it a little more though.
And here's a very crude idea of what the bungee would look like. I'm going to drill a hole in the end of the rack and leave enough cord to adjust the tension, then secure the bungee to the rack in between every hole with a staple (blue on the picture), at the bottom of the hole. Then as I install the rod handle, I can stretch the bungee of the handle to hold it down.