We really appreciate your details and photos of your build and your fail. I hope you don't mind more questions. Inquiring minds want to know! I'm glad you were safe, tried again and found a successful solution to your needs. I managed to fold one up, too, and it folded the same place as you describe. My mistake: I had moved the tripods closer into toward the center and tied off probably 15" outside the apex of the tripod, if my memory serves well. The fold was upwards, away from my body. Did yours fold up or down? Were you rigged into the tripod and rail pretty much the way your final version shows or did the rail extend out further beyond the tripod?