Very nice. Every time I go to wallyworld or somewhere else and see child playground equipment, I think of how one could "hang" there. "A" frame swingsets and such. The hand-over-hand bars could be used very easily unmodified.
I seriously hope you, and others designing stands consider patenting these things. It could very easily become profitable in your, or someone else's hands. Good to have your drawings/plans dated of course and all other info as proof of design. (seen designs for items still in development at my workplace, and yet another company was producing a copy. I have no clue how they got the design BEFORE tooling could be finalized. Just thinking theft.