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 based upon a stock plan. It is composed of 4 stock 24'X24' modules connected by 24' long links. The 4th side of the couryard is open. There is a basement under the 2 rear modules and the wider link. The basement has outside access. Each module is painted different to represent 4 different siding treatments. That's right: the brick, logs and stone are fake. The stucco is painted. The links are finished in horizontal siding. Main duct is modeled, the branch lines are not. BTW, all the window glass is the same size and square. Makes it easy to replace one.