So if you are like me you're tired of looking at the gaudy version of a nav bar and soft keys that amazon has come up with. So I started looking around for a way to modify the soft keys to look more like stock android. I may at some point dive into the framework and rewrite portions to do this, but in my search I came across an old method for removing the nav bar altogether. It is a very simple build.prop edit and at the same time adds some screen real-estate. I've confirmed this does work on this device, check out the screenshots below.
How to(rooted device):
1- You will first need a soft key/nav buttons app(once this is done the stock keys will be gone, and kinda hard to navigate without some). I like using Button Savior, it allows you to place the soft keys anywhere around the perimeter of the screen, and has multiple themes you can use. Also if you have the paid version you can change the number and position of buttons
2- Using a file manager navigate to /system/build.prop file
3- Open build.prop with a text editor, scroll to the end and on a new line enter:
Now there are ways to do this with launchers but it will not be permanently removed and will still show up in apps.
To get stock keys back just delete the line you entered in the build.prop and reboot