I didn't do a rear seat delete but I cut out the molded-in seat on a '56 T-bird, and you are correct that it is a challenge. One thing to make sure of is that you account for all of the chassis contours. I had to cut an entire section out and then create a new one using sheet styrene. If you have any parts box interiors without a rear seat I suggest seeing if the rear section can be used. I also did a quick search on roll bars for your car and I see that a lot of them don't have straight bars but curve around the seat. Well, good luck. Btw, what engine are you planning on running?