File formats : 1) SketchUp 2020. 2)SketchUp 2016. 3)SketchUp 2013.
Objects, Materials and textures are Logically named.
All Objects are Grouped.
High quality of Model - the sizes and proportions are observed.
All objects have Unwrap UVW.
Textures formats : JPEG (.jpg).
This file does not have any type of protection. You can reuse the scene, the render settings, the lights, the materials, but above all you can learn from the file, moving inside the project, observing how the light was created and handled, how materials are developed, what is the role that every textures play within them, and the values that fill every single option.