I really like that trellis! There are lots of wild bamboo thickets around here but they don't grow as big around as what you have for the uprights. Maybe I could use t-posts with an extension pole tied to them for use with the butterbeans. This is how I rigged it this year for them:
That's two lengths of field fence mounted one on top of the other. I'd have to think about which would be easier to put up. Those butterbean vines get really heavy.
Thinking out loud... I'm going to plant four 18' rows of Rippers. As a test, one row could be supported somewhat like the butterbeans, using different fencing I use for peas. Another row could be a modified, shorter version of what you have but using t-posts for the uprights and some 1x1's I have for the horizontals. Or maybe cut some of the local bamboo for the horizontals. Gotta think more on this.