The A Frame design is nice for cucumbers but I prefer straight sides for beans. They grow and climb differently. Beans vines spiral around their support. Cucumbers send out tendrils which attach themselves to the support.
I use several sets of two square tomato cages stacked on top of each other. I space each of these square towers about 18 inches apart to make sure they're getting enough light in between and I plant on all four sides. For green beans, I space my plants about four inches apart. For limas, more like eight inches apart. They just need more space. This method has worked well for me for the last several years. Let us know what you decide to do.
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Michele
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