I'll not post a pic, but will tell you about my very cheap bean trellis. It's an old fashioned metal A frame swing set. Leave those S hooks in place. A wire, sapling, or other method to tie the 2 front legs together, the 2 back legs together close to the ground, and run strings from the wires to the S hooks. While a very tall support may allow your beans to grow taller, it's important IMO to not give them a trellis taller than you can comfortably reach. I might try growing some on my deck rail. That way, I could pick from the ground, then go up on the deck and continue to pick some more. They'd also provide some shade. I think that some pole beans are programmed to grow taller than others. When I feel that the swing set doesn't give me enough trellis space, I extend it with a piece of conduit shoved in the frame support at the top of the A. On the other end, it is supported by (2) 2 x 4's that are drilled with a spade bit so the conduit fits through the holes. the 2 x 4's are then X'd to support the conduit. You can also do a conduit and 2 x 4 trellis if you don't have access to a swing set.