I finished filling the brake system with fluid this weekend. There is DH400 line(more expensive than platinum per ounce) from each caliper to the parking brake valve under the copilot seat. Nylaflow tubing then completes the dual brake installation by connecting to the copilot brakes, then over the nosegear tunnel to the pilot brakes and then to the fluid reservoir. If there is one compliment to be paid to Nylaflow, it is that  you can easily observe any air bubbles in the lines. But then, this is a one time compliment because after you install the header tank, the lines running over the nosegear tunnel between pilot and copilot brakes are no longer visible... If I were doing this installation for a second time (don't worry...I'm not), the layout would be fluid reservoir to copilot brakes, then to pilot brakes, then parking valve, etc.

Angier Ames
N4ZQ