Bumper might have just a little excess curvature, bout the body is blunted and too flat where the trim crosses across the back. It should be a gentle arc both upward and backward. Notice how the side trim sweeps upward as it rounds the quarter; the model is incorrectly done there, too. I would add some plastic across the rear and shape it to more closely follow the bumper line. It's a custom, so if you put a little "extra" curve there, no one can fault you! Very cool project, I've got an Imperial custom project going myself, so this really grabbed my attention. I'll post it down the road, but I've got a '58 Plymouth to whip first! Will be following...