Bob: Yeah, the thicker stuff looked too big, so I opted for dacron fishing line, which is a little tough to get a toggle to stick on. I pulled off the top and stretched the spring to give it more resistance when the top was back on and it worked better.
Konrad: Yours looks great as well! Did you just sew the cuben to the ripstop? Or did you seam stick it first? Did you seam grip over the top to help stop the punctures from spreading or has it held up? I imagine on something like this it's less critical. I agree cuben holds creases well (may not be good over time according to Richard's tests), but it makes it nice to work with! It got me excited to work on bigger projects.
Jack: Thanks for the link/info, I'm definitely going to try it out! No toggle would be ideal.