I recently completed a project I had on my to do list for the past year or two: To make a "car PC" with a high-end Android tablet using the storage compartment above the sterero.
I had a couple of specific goals with this project besides the obvious. 1) I wanted to be able to easily remove my tablet and take it with me for use outside my car. and 2) I wanted to be able to easily dismount the tablet and store it and the other pieces in the storage compartment with the lid closed so it could be out of sight.
The Galaxy Tab Pro 8.4 is now slightly more affordable than it was when it was the newest Samsung tablet. I got mine for through Ebay. The size seems to be perfect for this application.
I purchased the circuit board/adapter for the MD/TAPE port on the OEM stereo a while back to gain a 3.5mm audio input. I had a local audio company create a Y-cable that would allow me two different input locations in the car. One end of the cable goes to the tape slot between the large knobs on the stereo and I use it for my phone. The other end of the cable runs into the storage compartment where the tablet goes.
I cut a piece of wood that wedges nicely into the compartment and presses firmly enough to keep the lid sturdy. I placed velcro on the back of the wood and placed velcro on the audio wire and the charging cable to stick to the back of the wood.
I plug the wires into the tablet first, then pull them snugly behind the wood and press the velcro together. The pressure of the velcro holds the tablet against the top of the storage compartment lid. It is actually nice and firm without much movement.
Having the tablet mounted this way instead of inside the compartment (where the wood is) makes the tablet much easier to reach while driving and the display of the tablet is in full view with no obstructions.
I made the wallpaper
you see and made the icons for the apps I use most often. It's quite a blast having Sportscenter running on the ride home with the audio coming through the stereo. The "Ok Google" feature works beautifully even when the tablet's screen is off. I use my phone as a hotspot for the tablet so that I can voice command driving instructions to the tablet hands-free. Works great to play music this way hands-free too or search a YouTube video. Amazon Prime becoming available for Android recently was the icing on the cake!