I love this post. I'm going to do something similar to this. I really don't want to use a radio since it will be an extra battery drainage. I found that a Clarion Equalizer does the job even better than a radio since it have 7v outputs and I don't even use the radio. A good place to mount it will be where the cup holder is. Also to make it look more fancy i would trim the radio bezel so you can see the whole black glass screen of the nexus. This would also bring it closer. I do have a question about the wiring tho. How it the battery holding up? Did the nexus die on you yet?