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 Just an idea that I had. Layers can be used to view the floors. Start with turning off the roof for the attic, then the attic and attic doors for level 4, and so on to the level 0. Am still working on it. Textures are from Genetica Viewer and 'stolen' from other sources. Have a backup of the materials and components that I keep using with each update. Also have CAD experience, this is a similar program. You can edit as much as you want. Be interesting to see the results. Bob