Thanks, Pete. I figured it was standard-issue.
Just so we're clear though, I'm talking about what's under the latitudinal bit that's right in front of the shifter (as in your second pic, above). It's not covered by carpet; it's hidden by the rounded fiberglass bulkhead that you stick your legs over to reach the pedals. It ties the 3-inch round frame tubes together with that flat bit of steel that runs down the middle of the floor.
Mine has four small holes drilled through it to run cables, brake and clutch lines (you can just make them out in the pic). I had assumed that running those through would be relatively straightforward. I'd very much like to hear the details about why it is not.
My question is cosmetic: does anyone drill the typical "lightening holes" through the fiberglass part and if so, how to do it without compromising the brace, and how's it look afterwards?
My tendency here is to leave it as-is. I like the look of the holes, and the car I'm copying has them, but—despite all evidence—there are limits to my fanaticism in this regard.