I would avoid the word "recycled" in your concept formulation, as most items are not "recycled" but "down-cycled" which, insidiously, promotes the green-washing of ill-designed products and product packaging. "Recyclable" would be a much better idea/framing to incorporate, that is, use of items that are completely truly recyclable once they have met their design life (metal roofing, hay bale construction, etc.). A much tougher standard to meet, of course, Just my $.02