How about the structure of this bar chair (cushion and hardware rack)? How is it strong and convenient?
If it is manufacturers, ask manufacturers, I can not say. If you want to do it yourself, you should be in the room with the pipe level cross cross plus a welded or pipe steel, the strength of the steel sheet to meet at least 100Kg of the end of the external force (that is thick enough strong enough).
The picture is too small and incomplete to see the whole situation.
Specifically, you can send all the pictures more easily.