Rabbit and his students, they are professional and artists. I remember seeing the work done by your students and seeing their handy work on your car. Bravo for teaching them well. I took your inspiration and did my own front ground effect spoiler like you did. However my execution "lacks" your professionalism and artistry. Mostly I am just learning this skill and I am working without guidance.
Here is my own front bumper
I had issues with my front ground effect being too low and having beat all to hell by various roads. Hence I lost a lot of paint and cracked my original glue line. If was not for the rivets, it would have been a lot worse. (Thanks Rabbit)
Also I should have used a block sander (I have one now) to better blend the transitions between the compound curves.
I also wonder if my plastic primer just did not stick right. So when I get my rear passenger door/frame fixed I just might more inspiration from the rabbit and add those wheel wells.