How about putting the head unit in the glovebox? As far as speakers go... I think you may get 3 pair of 6 1/2 in each door, 6 6X9's in the package tay, Possibly some in the reear arm rests, A trunk full of subwoofers, and you still have the stock locations to work with. You need 4 amps. Digitally split the signal from the head unit into 5.1 surround. speakers in the doors are fronts, package tray, rears. Subs to the trunk and the 2 factory speaker locations woul be the canter chanel speakers. Just I thought, Carl