Well, it isn't much of a mod but I had to make a phone mount. Nothing on the market puts the phone where I want it and they cost too much anyway!
I used 1/8"x3/4" flat stock and 18gauge aluminum. The flat stock just slides in above the factory radio (dead center) until it hits the firewall, and it solidly wedges in place. Just bend it up at a 90 degree angle where it sticks out and cut it down to two inches vertical.
After that I just measured and cut a template on the aluminum, folded it up (like origami!) and mounted it to the vertical portion of the flat stock. I then rounded off some corners, drilled holes in the bottom for my wires, and Voila! perfectly placed phone mount. It's placement allows your phone to be a good dashboard cam too!