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 Delta Class Defense Stations are heavily fortified and armed structures based on a hollowed out asteroid base. Using modular structural components, the asteroid shell is embedded with them. The asteroids provide large scale armored plating as well and being found in abundance (already hollowed out) left behind after being mined.