When I got to Page 26-7, the last instruction states that parts of the brake system can be installed at this time. I'm trying to figure out why I would do that. I started to install the lines (TS flightiness), but there doesn't seem to be any benefit, and I can't actually connect them to the tunnel walls yet because there wouldn't be room to rivet the bottom skin to the tunnel walls if I did that. Is there a reason this step is called out now? Would it make more sense if I was making my own brake lines?