I installed it on Tuesday and took a few pics of in case anyone is interested. Sorry about the poor quality and glare, but had to use my iPhone and since it has no flash, I had to park it outside to get enough light for it.
Like others have said, the 5140 is basically the upgraded, 2009 model of the 5120.
I had to extend the holes on the OEM brackets to get it not to stick out, and might have got it a little too far back by a about a mm or two. I also decided to try to make the edges flush rather than the middle or splitting the difference. There are some slight gaps around the edges between the unit and the Metra face, but the are tiny as well. When I showed a buddy today the first thing he said was "Wow, you fit that perfectly", so I guess it's pretty good and should stop letting the OCD in me worry about it.
For the iPod connection I cut a hole in the middle back bottom of the cubby under the rubber mat. I made it just big enough to fit the jacks through. While this may seem like a weird way to do it, I decided to run the female USB jack up through it, then connect the iPod cable, run that back below the cubby and then the iPod cable come back up the top. This gives me access to the USB port on the unit without having to take the dash appart while at the same time not have a ton of cable coiled up inside the cubby. (The iPod cable is pretty long). Optionally I could have had the connection on hanging out the side of the dash in the floorboard, but didn't want any cords showing and this way they don't when the cubby door is closed.
[The mat is up a little on the side in this pic and stuff is moved around to show it all]
Today I decided to change the boot up screen from the Default kenwood one to the Z logo:
Below is the actual image I'm using, if anyone wants it. For whatever reason it's not perfect on the DNX5140's srceen and distorts a little on the circle, I think that can be fixed with some size adjustments on the image size though. If someone fixes it or makes a better one, please let me know cause I suck at photochop.
Also to change the bootup screen on the Kenwood DNX5140 you do the following This works on several other Kenwood DNX units as well, but please note that when I did this it cleared out most of my settings, radio presets, etc, so I recommend doing this BEFORE you go adjust the settings on your unit.
1) Connect a USB flash drive that has the image on it (See why I left the USB port accessible!!!
2) Hold down SRC+EJECT while pressing the RESET Button.
3) A screen will pop up with two choices "Kenwood Image" or "OEM Image"
4) Select OEM image
5) Select whatever file from the USB drive you want to use and press enter.
6) Turn off the unit (Hold SCR) then power it back up (Hold SCR again).
Your image should now be displayed when the HU boots.