Feeling inspired by black thunder then zedix along with many other videos and posts of android tablets being mounted into cars I decided to try my own Nexus 7 install.
Here is how it came out, I'm pretty pleased with the result.
My Parts List:
Subaru of America Double DIN AV Panel (ia Performance)
Google Nexus 7 (Staples)
Parrot MKi 9100 (Amazon.com)
Rocketfish Dual USB Vehicle Charger (Best Buy)
Tech Armor Anti-Glare & Anti-Fingerprint (Matte) Screen Protector (Amazon.com)
eBay snap on back cover for mounting N7 (from seller "toolmld")
Custom built acrylic double DIN sized "box" as a support
Metra 95-8902 Double DIN Installation Kit cannibalized for brackets (Amazon.com)
Metra 70-7552 Radio Wiring Harness for power tap (Amazon.com)
Enercell 12VDC Vehicle Power Accessory Outlet (Radio Shack)
StarTech.com Micro USB Cable - A to Right Angle Micro B (Amazon.com)
UPDATE: Now using Anker 24W car charger, seamless fast charging. http://www.ianker.com/product/71AN2452CSS-BA
I already had a Parrot MKi9100 in the car and mostly used my phone to play music and do navigation so I rarely used my actual head unit. A android tablet would just continue to use the same bluetooth connection for audio output so I only had to worry about mounting and powering it. The Parrot would take care of driving the speakers and providing speakerphone services.
I ripped the head unit out and tried out the tablet in the car for a few weeks.
Once I got all the software working and I was happy with how the overall integration felt I started to design the mounting method.
I knew I wanted to use a stock bezel and saw pics of the N7 fitting neatly behind a double din opening but didn't know if the width of the tablet would fit under the curves of the subaru bezel. After I saw the fitment in zedix's thread it gave me the confidence to go for it.
Trimming bottom tabs, I also had to trim off the top center tab.