I'll try and answer some of your questions.
1 I have mine mouted right next to the rear view mirror, It is hardly visible.
2 I removed my center speaker so I use it to mount the antenna it not seen.
3 Yes you van use the the center console for the usb. Just take off the rear cover useing the 2 phiilps screws. Unplug the factory cable in connect the new cable. I used this cable cable.
http://www.monoprice.com/products/pr...t=1#largeimage
4 The blinkers does not go thru the microphone.
5 I do not any thing about the Kenwood back up camera. I have a crimestoppers that mounts on the License plate.
6 The backup sensors does not work. I have a Pioneer head unit and the streering wheels controls work ok
7 did put in speakers so I do not know any thing about the
Dynamat so I can not help you with that.
That all I can tell