OK, you're onto me. I am using the US car tool kit and Hotchkis suspension. I am moving the battery to the trunk, and didn't want to deal with passing through the firewall. I snaked the conduit through the frame rails and come out next to the starter, just behind the brake distribution block. I couldn't bend the conduit and install it up over the rear axle, so I 45ed it and come up under the rear seat. I welded reinforcement plates everywhere the conduit passes in, out, or through any frame points.
Oh and the welds are just tacked in for now, while I'm working on something else, I'm not that good but I'm not THAT bad either.
Actually, you'd be really surprised how different the car sounded when you knock on the floorpans, with just those silly little pipes installed. No, they don't touch the floor pan anywhere.
You know, the gorilla tape actually works pretty well.