Welcome to the board. Cool that it's a slick-top, and that Super Bee reminds me of a buddy's old car out of Simi, CA.

Wish I had some good photos of original front aprons/wheelhouses, but someone else here should.
The various access holes were masked off, typically squarish, by about an inch.
Apply over body color, which was basically mostly overspray.
The stuff was basically hosed on; usually you can see build-up edges side to side on the floor pan as it came out of the gun.
Same kind of buildup is vertical inside the quarter panels.