1990 944 S2; I started the same project several years ago but decided to leave the car stock. It is still that way today. Then last year I purchased a 1987 911 Cab. I've attached a few pix of my rear seat delete box. Your right about the sound deading effect with rear seat removed. I cleaned out the old sound deading material and in stalled "rumble mat" and then a layer of "B-Quiet" under the aluminum delete box. I still need to finish off the project with carpet and leather covering several of the deck and side pieces. This work thing is slowing me down!
