I added an EQ that is a half din in that compartment and found it to be a very tight fit. I'm surprised to see that someone was able to fit a single din there. My only thought is I have the dual climate AC controls so guess that takes up more room in the dash than the standard AC.
Also re-locating the start button is very easy. The cable had some length to move it around, or just cut some wires and extend the plug. I moved mine to beside the gauge cluster without having to cut or splice any wires.