A 2ch Kannagi fan and architecture maniac has created what looks to be the definitive recreation of the Nagi-sama residence (formerly inhabited by Jin). With this blueprint you can (probably) build your dream home (goddess not included).
A rather humble domicile all the same. Particularly in urban environments such as the area apparently in question, such cheap wooden structures tend to be like inviting the street into one’s home. Not recommended.
Leaving that aside, it is impressive, as are so many of the works of true obsession we are so frequently presented with. But is it really completely accurate?