I'm pondering the same question. Unfortunately, my Cabrio was crashed into last Monday, resulting in damage to the nearside rear wing. It's fixable, but long story short, I'm now trying to gain access to the back of said wing to aid in straightening it, and began yesterday by removing the rear seat panel. I also intend to re-adhere the fabric to the rigid panel before reinstalling it in the car. If I find a good solution, I'll let you know!