Recycled Units - letter to Gaston

Gaston, since you did great research with the stackable idea, please research if there are any components (like the shipping containers) that can be reused for this project. We're shooting for a standard classroom module of approx 20'x20', so perhaps several need to be used to create one space. But then we have to consider the professional expertise required for customizing the units so the reach the minimum size. What is the cost of such a unit? We'd also need to consider shipping of such units to the job site, and related costs. It seems possible that in the long run shipping of materials for construction cost would be minimized if each component is not too big. I will have the students model on inventor some standard columns, metal open web joists, wall panels and floor/ceiling panels. I wonder if you know where to look to find costs of these materials, so we can see how they compare to the recycled units referred to earlier.