It is refreshing that you thought to start a thread on MYOG about this. It is good to hear experiences with Cuben gear on the GEAR forum, but working with it to make stuff is another matter entirely. I'm looking forward to hear what people have to say, especially if it is new.
My biggest puzzle with the GEAR threads was that some report failures, and others say it's just peachy, and for thousands of miles. Since we live on the same planet, they both can't be right.
Over the years, I've acquired Cuben from a number of different sources, enough to know that its composition varies and behaves differently. It is not all the same. Some I acquired directly from the manufacturer was mislabeled, and was something quite different than what came form Quest, which in turn was quite different from what came from Zpacks, which in turn was quite different from what came later from Zpacks. When I say behaves differently, I'm talking about holding stitching, and what happens when you stress it after using various adhesives.
OK, the reason I have a bunch of it lying around is I'm just not confident with it, and am never sure what it consists of. Could go into the reasons, but people have made their decisions by now and that's not what this thread is about. Bottom line, an idiot knows that something more flimsy than a cigarette package wrapper won't hold stitches, and if you can bond it, it will tear into tatters when the bond is stressed.
That leaves the unwoven threads to do the heavy lifting. Since when did unwoven threads of anything do heavy lifting? The material would be great if its typology were reliably standardized, and the fibers were formed into a woven thread; that is, a fabric. Maybe someone will do it, and revolutionize the industry.