A good concept, but poor implementation. I digg the overall construction, however:
1) Needs wedges. The overall shape and design is brought down by the hard corners and overall blockiness of the structure. The station is made of very nice round shapes. They should be softened with wedges.
2)The whole station is symmetrical, but the docking regions are not. They all sit on the the top side of the station, with the exception of the center ring.