Great mounting idea. I went to duplicate your installation but have a problem and before I call EStopp I thought i'd ask here. The unit I received has a much shorter cable than what is pictured in your installation and certainly not long enough to make the 180 turn back. Did you modify the unit or did it come with a longer cable? Pic below is what I have.
Just finished the installation, it's a pretty nice piece. I used Lokar cables, they are also pretty sweet. Smooth inner liner makes for a slick cable pull even with some pretty tight bends.
This will all be covered with the center console and the rear deck area. EStopp is a little loud to be mounted inside but since this will all be covered with the center console and rear deck, most of the sound should be mitigated. The button is pretty nice and overall a pretty clean set up.
Mounted it on some 16gauge with the nuts welded underneath.
If you buy the Lokar cables, you won't need the EStopp splitter (the machined Al block) as the Lokar kit comes with a pretty nice splitter. The Lokar set up is actually a little tidier.