Here's a picture of one of the brackets in CAD and another close up on the truck. They are fairly simple, but interestingly, the roof rack mounting locations on the truck are not parallel. They actually taper towards the rear. Also, they aren't flat, they are angled outwards 6-7deg. So it took a bit of precise measurement and couple mock-ups.
The brackets were cut on my CNC plasma table and TIG welded.
If anyone has one of these tents, I would entertain the idea of selling them... something else do other than drink beer in these crazy times!
PM me if you're interested. I will want to verify some measurements on your tent and the first 'customer' will have to be a bit of a guinnea pig to make sure my tent is in-fact exactly the same as the Roofnest and Falcons.