Thank you for the biome changer. I would like to ask if I could make us both a server where we could build the the city together. it really sounds like a amazing project and i'd like to help any way I can. P.S: thank you for the pic.

sounds cool. try this http://www.minecraftforum.net/topic/1119044-tool-biome-painter-08-edit-your-minecraft-worlds-biomes/

idk if it will do what you want it to though... also, i'm not sure why you would need to change the biome.

i was thinking of doing this mysealf. i was going to do a city with some key structures like yki's and yuno's houses, the school, the tower that 7th got married in, the hospital, etc. then i was going to put that in the nether, but then the skybox wouldn't be right and stuff. yh anyway i can't be bothered atm, but might give it a go later XD

also, i found this pic if it helps. it shows some of the detail better http://dsingularity.net/wp-content/uploads/2012/04/vlcsnap-2012-04-02-00h15m53s178.jpg

good luck! :D