For my new car the kia sportage, there is no screws visible and all the parts fit very snugly. Cover to covers space is around 1mm as its a seamless join. I too was skeptical about workmanship. For my back area, Kevin took out the all the covers and back seat to treat the fender. After putting it back they look exactly like new, like there is no evidence of the covers being pried open. In total he took out 5 covers and back seat. So should not be any issue with workmanship. If you are worried i would suggest go on a day where there is not much customer and you can inspect the work your self. I did it for my 2 cars and it was superb watching them do it and did not even need to supervise them during the reinstalling back

For the price i paid it very much more professional that the other vendors i have been too