Any rapid prototype assembly model of a standing structure such as a bridge, building, house, stadium, etc. These are models made from CAD data and completed as a solid 3-D model or 3-D assembly. A structure may be 3-D printed as a one-piece model, or the combination of multiple parts held together with glue, fasteners, snapped together, or 3-D printed fasteners. Moving parts are NOT acceptable. No drawings will be on the front of the project. Model not to exceed 18” X 18”.