Cut one of the templates out of a piece of my scrap ABS, used my heat gun, and bent it. The pen mark is still vaguely visible, I have spraypainted it with 2 coats but it needs a 3rd tomorrow. I did this because I am trying to get experience with the material before I go hacking away at the wheel skirt piece and destroy a dozen dollars worth of material.
The posterboard template (top) and the cut ABS plastic piece (bottom).
Here it is slapped in briefly. Will need a bit of adjusting still but I am happy with the result.
Later I'll attach this permanently with screws and L-brackets inside the bumper to make sure it doesn't go anywhere. For now I'm just test fitting. Turned out pretty great so far. Right side tomorrow. Onward and upward!