Carving wheel wells
I bought a 2" (couldn't find a 3" for cheap) drum sanding attachment for my cordless drill at the local hardware store. I marked where the wheels would rub by installing the trucks and wheels on the unfinished board, loosening the trucks and leaning them over.
Here are the rear wheel wells (above). After my first attempt, I reinstall the truck and wheels to check my work.
Here are the fronts.