Here is my third Greeble Kit Bashing set. 

The geometry is fairly clean in parts, but can be cleaned up. Its for kit-bashing or concept renders and not meant to be production ready. However, if you'd like to make it production ready you can under a Freelance/Studio license.

I have not use subsurface on any of these meshes. Below is an example of using some of the pieces.

Not included
UV maps
Perfect topology
Polycount optimization  

Jump over to Youtube.com/markom3d to see some of these assets in action. 

You are able to download either in .blend or .FBX