This is an absolutely top notch build. The exterior is some absolutely inspired design work; it really looks and feels like a refinery in space. The angled tanks work great, and the barren service tunnels and walkways add something extra to the build.
Despite some functionality problems, no airlocks, an average interior (for Skylord,) and a hangar that's just "meh," this build's look and feel easily carry it to a 5/5.