Cobbled from surplus warehouse junk, here is the base of operations board for my not-colonial troopers. The raised station is topped by a rotating command observatory, and a small combat platform. To the right side is a dropship port, and on the left is a fusion reactor (accessed via crawl tube). Beneath the station is "garage" space for maintenance and military robots/vehicles. Behind the base is an atmosphere scrubber and waste recycling silo (intake vents on rooftop). The front panel the red ramp points toward hasn't had the main airlock attached yet.
Since this (purely primed) planet-side base doesn't belong to the blue blazoned space marines, it will likely have a tan/earth paint job.