So what I’m hearing is this is not necessarily a prefabricated request… Well this is a start! The shelter is for a commercial space that would need to cover at least a 50×150 SF space in order to not look diminutive. I’m not married to the idea of metal, but was in search of a material that was quite impervious; although the idea of a greenroof is intriguing. Thank you kindly for your suggestions. I believe I’m headed in the direction of a landscape structure that relies on art to double as a showcase for water conservation and a stylish feature that fits commercial high end design expectations.