In reply to Jim.

Maybe a school project for the materials for the model, have the older kids gather the bits of wire, straws, cardboard and bits of wood that can be painted and pasted to look like pipe, cement walls and steel roofing.
I bought a boxwood plank once for one of my builder buds for making models. He cut that 2"x12"x10' plank into enough strips to build 5 years worth of models. Is there balsa wood growing in your area? Models are a lot easier if your building out of something you can cut with a box cutter.
Have you thought about solar gain on how that school sits?