Fabricated new hinge arm for the cabin heat cable. Secured cable to firewall with adel clamp. Worked perfectly. This was all due to my locating the cabin heat cable on the right side of the panel which resulted in a reverse cable actuation without using this hinge arm to allow cabin heat to be off with cabin heat knob fully forward. Just took some extra time to engineer a solution. Installed parking brake cable per the plans. Hooked up all brake fluid lines but not torqued yet.