Great idea! I accomplished the same thing using a soldering iron. I got the carpet lined up in its final position and then used the soldering iron from underneath the car to burn out the holes for the seat bolts. I used an awl from the top to locate the screw holes for the dimmer switch and the foot pump and then used the soldering iron to enlarge the holes. Works great for making holes as it melts the carpet together and prevents fraying.
