I went to the local Airplane Depot to get some 1/2” thin wall PVC tubing but as I looked around I found some 1/2” PEP tubing also. Comparing weights, I would guess the PEP weighed about half of the PVC. I found that the 3/4” PEP weighed about the same as the 1/2” thin wall PVC, so I opted for a larger diameter for the given weight since I’m thinking of running both wiring and 2 pitot lines to the wing tip. The PEP tubing is also a bit more flexible than the PVC.
Instead of Adell clamps and bolts, I decided to bend some shallow channels out of .020 aluminum. I placed the tubing in the center of the large lightening hole to give me as much room as possible for riveting the skins onto the nose ribs.