It happens

I started by mounting the end pieces above the rear bumper and lights.
Next I mounted the taillights.

 At first nothing seemed wrong. But then I noticed a gap at the taillight on the left side. And by trying to push it back it popped and the paint cracked.

 So I'm feeling very bad. The rear panel has to be repainted.
But not just yet. Later on when the car is almost completed and we are sure nothing else went wrong.

Despite feeling bad we have to move on. I also mounted the springs back on the trunk lid hinges and put the gastank back in its place I do have to find some more screws to fasten it securely in place.