Just did my switch install on my 21 At4 1500. And boy it there a lot more to it if you have to replace the kick panel. There is a YouTube video I also followed for that part (CJ Garage) where he installs the whole kit on a Silverado. Only part I had to figure out was the wireless charger and cup holder removal to get to the bottom two screws on the entertainment unit. Photo is of truck taken apart.
Thank you OP for the write up. Helped on parts of the install