The dead pedal is just screwed right in to the floor, but it never did hit metal. The screws are only like 3/8" long or something, not long enough to get meat, but they hold great though, that things not movin.
The actual pedals required drilling. The throttle was probably the easiest becuase its plastic back there. The others were a little more tricky. I ended up using superglue to set them in place and used the holes in the pedals as guides for my drill bit. Without it, the bit would've just walked all over the place and I probably never would've gotten it drilled straight.