Here is a simple diagram of a double layered surface system. This strategy of layering two surfaces to produce the enclusure and coverage as necessary, can work for many of your projects. You will each need to identify where/how/why the two surfaces come together. I would propose for many of you to use your field analysis drawing that you have placed in the site for the building-site scenarios to identify areas of "most rigidity" or "most condensed" - these intensity zones in the map could then be evaluated for their ability to operate rigidly, literally being the points of connection between the layers.