there are two options for the perforating wall. i like the first one which bring two quality inside and outside. i am not putting material to render now but the different effect will be more extreme after i render it with metal. at the moment the largest spacing is 900mm tough it lookes quite closed here. more perforating quality can be seen with different angle, i am showing this angle because i can only get the lighting correctly like this. I am building up the wall by rhino now so we can discuss the whole model tomorrow. And I am thinking to 3d print these element and then wrap it with aluminum sheet. what do you think?

thanks