I am pretty much certain when I place my order for my Coupe that I will not opt for the Premium package. Rather than having speakers in the rear deck, I was interested in constructing an enclosure which hangs from the rear deck either housing a 10 or 12" woofer. Something with a semi-shallow mounting depth so not to drop down too far. I guess my major question is how much room are wee looking at from teh back of the back seat to the opposing side of the rear deck?