Hey Charlie, when I got my -12 back from Nick Smith he had welded little pieces of tube and had used electrical conduit for stringers. Looked like a good strong setup. Still haven’t covered it yet.
Hmm interesting, some kind of wood spar Cub clone? I ended up just buying Univair’s stringers. Prices weren’t and bad freight wasn’t as bad as I thought. Should’ve said it’s for a certified PA-18.
I use the Hat sections that AC Spruce sells. It's the same as what is on the top/center of Pacer/Tri Pacer fuselage. Light weight and strong. Wood just almost never holds its shape.