Hi I just got a 2014 nav I love that look and planning to do the same, how did you do it? Did you use paint or vinyl..for the door panels how did you paint them (it would be awsome if you had a video explaining how you did it)
it's paint... pop the door panels off the handles are press fit there are notches on the side to pry them up. the speaker grilles i don't remember if they are screws or plastic rivets... either way easy peasy. you should be able to search for a tutorial on removing the door panels.