Transmission shield or tunnel cover

I have a CSR Shield in my Demon, never had to beat up my floor. But anytime the trans is out the motor came out at same time. Made life easy. No plans for the track, but I'm optimistic that I'm close to 600HP and don't really want to lose my feet if it comes apart. Dyno time to come soon. For those of you in the know, can braided fuel line be run on the inside of the frame rail and pass tech, or is it a fail unless hard lined? Thanks.