I seem to recall you at least asking me for my CAD drawings of my racks and crossbars. To which I politely refused.
I'd like to think I have tacit copyright on my racks and crossbars, as the Rover community is based on a small brotherhood. I just hope no one decides the have a need to fill the tiny demand for these niche products while I am deployed for another two years.
And no, just because you build a cage or a rack, doesn't inherently give it a copyright.
If you want a patent or copyright, you better be ready to defend it and have the liability insurance to back it up too.