[jyl]

Yes, it will look cheesy.

The red car is trying to look like a race car, a quasi-935. On a 1980's 911 race car, an all-fiberglass tail looks okay, because the race 911s of the day in fact had all glass tails. A cabriolet is obviously not a race car and would look silly wearing race cladding like the deep air dam and all glass tail. It is a rice racer look.

The 964 doesn't have much black trim so the all glass tail looks nice.

Again, feel free to disregard these opinions, it's your car.