The document discusses using Sketchup software for scale modeling. Some key points: - Sketchup is a 3D modeling tool that can be used to design scale models and print scale plans. It has drawing tools and allows designing to actual measurements. - The process involves finding reference materials, creating scale plans in Sketchup, and then building mockups and models using materials like styrene or wood cut to the scale plans. - Examples are provided of models created in Sketchup, including a railroad station grill, barn, and terminal station. Building a mockup first is recommended to work out complex areas before the final model.