I spent some time to wrap up a basic node/beam structure and placement for the headache rack and antennas. Please refer to the readme for the code for the nodes, beams, shocks, and flexbodies sections.
I did some digging through the old repository today and found some of my old files. I got this cleaned up and all of the materials working. Just drop everything into your vehicle's folder and place the part using the props or flexbodies section of the wiki. Unfortunately I did all custom n/b for mine and some shoddy work at that, so I would be sharing the placement yet.