You can cut it wherever. If the wheelhouse and cutout area hadn’t been mangled, I would have removed a one-inch strip around the quarter lip. Then again, if the wheel house hadn’t been mangled, it wouldn’t have trapped moisture in the seam, and the quarter would be a mangled, rust-free factory quarter like the right side. The only reason I hacked it out was because I was starting to loose the wheelhouse to rust, something car doesn’t have, and I marked the patchwork.
As for the wheelhouse, by the time I did the Gorilla Monsoon on the mangled area, I couldn’t restore the beveled area because the metal was too work hardened. I did, however, do an excellent job at replicating the cove in the patched areas.
As for cost, the skin was a $40 roadside cash & carry purchase from someone who was using it to practice painting. The paint was $300. I did spend a couple of dollars on sandpaper. But no one else talks about what they spent on sandpaper; likewise, I’m not going to talk about it.