Firstly, I’m sorry for late reply, last week I’m still business trip at Indonesia reference your design, the design was wrong an open side, must revise to only 3 open sides as the design is 4 open sides. And the back wall must reduce to 3.5 m(H). as the design is 4 m(H). if you need to build the structure higher than 3.5m(H) must be set back from neighboring stand 1m and not wider than1/3 of its area. and I also attached regulation fitting, your stand area as attached.