The nexus 7 will fit in the navpod. My original intentions for buying my navpod were to wire up a lcd screen with an hdmi input and mirror my android onto the screen for navigation and possibly other apps, but after looking at the cost of some of the lcd screens (lilliput, xenarc, etc) it seemed more sensible to buy a nexus 7 instead. The nexus was cheaper in some cases and it can do so much more than just the screen would have been able to do. I recently purchased a nexus 7 and once the little tabs on the inside of the navpod were trimmed down the tablet fit very well. Here are some pics I took with my phone camera:
After that I decided that I wanted the tablet to be removable so I split the navpod at the seam and JB welded in some 90 degree brackets to hold the tablet in place on the back half of the navpod so the faceplate is removable. This way the tablet sits on the tabs attached to the back half and the faceplate can just slide on over it. I haven't had any issues so far, the faceplate fits snugly into the dash so it doesn't fall off or anything.
I use my phone as a mobile hotspot and connect the tablet to that so I can use the navigation and whatnot. It accomplished my goals (mainly navigation), especially when compared to buying a lcd and mirroring my phone. With the tablet I can touch the screen directly and it's very easy to move the map around. If I had used the mirroring app then I would've had to look down to the phone to navigate menus and maps which seems more cumbersome. When the tablet is connected to wifi it has speech recognition which makes searching for and entering addresses very simple.
One issue for me was that the lock/unlock button is on the side of the tablet, so turning the screen on and off was an issue. I didn't want to cut up the navpod to fit any levers or buttons to hit the lock/unlock since I thought it would look bad and the navpod cost twice as much as the tablet! I settled on using an app that locks the screen which is accessible from the drop down notifications. In order to turn on the screen i use a magnet. The nexus 7 has a magnet sensor which is supposed to be for sleeves and cases for the device and it is supposed to turn the screen on and off depending on whether the case is opened or closed. I just use a regular magnet to trick the tablet into thinking that I'm opening its case so the screen will turn on. The magnet trick wouldn't work for turning it off because that would require the magnet to stay pressed up against the screen. Once the magnet is pulled away the screen will turn on again.
I currently don't have a usb plugged into it for power but I ordered a grom audio unit so I'll be able to connect the tablet to my stereo via bluetooth and the grom unit comes with a 5v usb out so hopefully that will do the trick for charging the tablet while it is mounted in the car. Its a tight fit but a 90 degree micro usb plug fits for me but I had to trim the rubber on the plug to slim it down.
It's also great for netflix'ing if you have time to kill, like waiting in line for some of those popular M&M blueberry donuts.