When I was installing it I ran into the same problem everyone does. There's nothing to support the deck on the back. The stock deck used a rubber piece that screwed into the back, which is obviously not the same size as the hole in the aftermarket deck. My solution? Make something similar! I wrapped a bunch of layers of electrical tape on a banana plug. Then I inserted an M4x30mm screw into the narrow side, and two matching M4 bolts into the big side to hold everything solidly in place. The result was a piece that fit perfectly and holds the deck quite solidly in the back.
The scosche wiring harness didn't have an illumination wire in it, and I didn't notice that until after I bought it. I didn't want to cut up the stock harness since that's why I got the scosche in the first place, so I made my own illum wire by inserting a wire (orange) and taping it in place. The ground, I wired to an alligator clip and clipped it on a piece of metal. I'm a little concerned about it falling off, but should be fine as long as nothing pulls down on it.
The radio box (B02A-66-9M0A) fit perfectly in the bottom slot and was only $12. I wasn't about to pay $120 for the MSP pocket just for a little door. The box fit so perfectly that it snapped in solidly, and sat flush without moving. The mounting cage for the radio, though, didn't have anything to hold it. I didn't get the MSP radio support bar, so I put a piece of cardboard between the pocket and the deck. Holds it in place well enough but it's pretty ghetto in there. I might get a support bar eventually just to make it clean.
