This evening I dove under the panel and laced up the main harness running aft of the firewall. Not a comfortable place to work, especially in the heat. I also put in some wire-tie mounts that will support the RF cable on the right side of the tunnel. And another mount for the PTT wire going to the passenger stick.
I split some 1/4" tube and put it over the edge of the angle on the firewall to prevent the wires from chafing where they cross. I will epoxy this tube in place once I have final fit on the center tunnel.