You are most correct. some cars just don't look right to most people, some things are sacred, and some cars are hard to customize (and make come out looking right).
Mostly I think this body style is just hard to change and make look right.
It was good looking work, no doubt. I even liked the marker lights, and a few other things they did. the billboards were not a personal favorite, they just did not "fit" the body quite the right way. But! to be fair, I am not a huge fan of billboards on Cudas .... so I guess they would be hard to win me over on any way you go.
The sounds was pretty decent