This 3D model was originally created with Sketchup 8 and then converted to all other 3D formats. Native format is .skp 3dsmax scene is 3ds Max 2016 version, rendered with Vray 3.00 This is a model of a paper model of Prague Castle. You can download a copy to print and assemble from bestpapermodels.com. The other one that I recently built is Bran Castle. A lot more complicated. This is a shell only - someone can put an interior in it. The model scale is 1:300, so it was fairly easy to calculate the size of the various parts. Windows are components, they are in the approximate position. The windows in the 4 arches are purely guesswork, as is the tunnel (?) on the other wall. A bit of research should make it right.