From what I can see in your pictures I can make the following simple suggestions:

1. Toss that nasty-looking BOSE head unit and replace with an appropriate DIN kit and the empeg.
2. As above, but put the BOSE into your arm-rest or if it fits, into that pocket on the forward sloping part of the armrest.
3. As #1, but it looks like your factory unit may fit a DOUBLE DIN - this will allow the empeg plus an aftermarket head.

You may want to do some searching over at the www.carsound.com forums and/or also ask some local installers what they have done with aftermarket heads in the past.

Don't mount the empeg vertically and don't hide its very useful display. Hiding the face of another head, including the stock one is much better alternative (though more wiring will likely be involved).

Bruno