This 3D model was originally created with Sketchup 13 and then converted to all other 3D formats. Native format is .skp 3dsmax scene is 3ds Max 2016 version, rendered with Vray 3.00 Not sure what this is, maybe an onion dome, but it fits on a 16' octagonal base. Use it it you want to. It may show up in a future model. Just a little something I whipped up this afternoon.