You can take that whole plastic jack bin out btw, and there's an 8 pin connector all by its lonesome down there too. (rear seat heater jack?) 1 in 4 chance of a hot lead!
Then you just have to figure a way to fasten the jack, but you'll have even more room for the amp to breathe etc
I like that sub mod. I have the non CD boot cover on mine, so I have a self amped bazooka that plugs and plays.