They have switched to a new frame design and I don’t know what they do now, but the round tube frame shown above has a 3-sided rectangular tunnel welded in. Bob the underside of the car there are fiberglass panels glassed in. In later cars the one under the pedal cluster was removable. I had to cut the fiber glass holding it in to make it removable, but doing so sure made access to the clutch cable easy. You can change the cable without removing the pedals. Much easier!