a very nice render with a perfect amount of detail not too much and not too less imo. the lightning is also very nice. the thing i dont like is the bg. the gardients destroyed a lot of the work imo, could maybe coverd with some soft brushing. but i know gardients are almost a problem.
you said by yourself your were out of ideas last night and wait to get a few suggestions and ideas. i would place another station in the bg, not to massive, a little bit blured and covered with fog. or maybe make the station longer in a bend like shape.
i also would try a material. i dont know anything about c4d so i dont know what c4d can and what not. i would try a blend material with a mask different dirty rustlike textures. one grey and one brown. so that it look a little bit older.
whatever, i think you will get some got ideas, but promise me something: keep that lightning its a perfect mood