If Ikea made a headache rack: a concept

I don't think I need a headache rack but if Ikea made one, I would likely purchase it just to see if I can assemble it. I will likely carry on this little experiment and use wood and cardboard for rapid prototyping and see if a local fabricator can give me a reasonable quote because why not. The challenge here is to keep the existing tonneau cover and purchase a new header rail as the base for the structure. There should be ample options for securing the rack. If this concept becomes an experimental project, color will likely be matched with predator step. Maybe. What would Ikea do differently?