Depends on what you get your holders for, 350-550.
Then I'd say 15-20 hours of cutting, sanding, epoxying, fitting, wiring.
It's not easy, I was going to make a DIY, but realized no one will want to do it.
You literally need to make custom mounts for the door to mount to, and the holes you see in the top of the console aren't far enough apart so you need to cut the top trim out of the escalade one and graft it into the Denali one.
It's a mission I'm fairly sure no one has attempted before and most likely never will again. But I'd love to see someone else give it a shot, clearly it can be done..
PS, everything's forsale for the right price haha.