Well the main problem is the side door which still shows some weird distortions. (See the image before)
Furthermore they needed about a week to fix the main problems, but they forgot the distortions at the trunk, which I had to fix myself.
Unfortunately I don't have the skills to solve the weird distortions at the door.
But yes perhaps those problems are based on the complexity of the car itself, so blaming humster3d wasn't correct. I simply don't have enough experience to give a precise assessment.
Do you have some other tips, which could help me, to improve the renderings? :-)