Shiro Lvl 1 (based on Aya-jo)



http://www.jcastle.info/castle/profile/89-Aya-Castle
Shiro Lvl 2 (based on Matsue-jo)



http://www.jcastle.info/castle/profile/26-Matsue-Castle
Shiro Lvl 3 (Shiro lvl 2 with an an extra building added to it)


Shiro Lvl 4 (based on Matsumoto-jo)




http://www.jcastle.info/castle/profile/53-Matsumoto-Castle
Shiro Lvl 5 (based on Himeji-Jo)





http://www.jcastle.info/castle/profile/32-Himeji-Castle
Other castles:
Osaka-jo

http://www.jcastle.info/castle/profile/61-Osaka-Castle
Kumamoto-jo (Ginnan-jo)

Kumamoto-jo is one of the three largest Japanese castles (the other two being Himeji-jo and Osaka-jo), most famous for being the locus of the Satsuma rebellion, during the Meiji restoration (the main theme of the movie "The last Samurai").
http://www.jcastle.info/castle/profile/8-Kumamoto-Castle
Guide to Japanese Castles (http://www.jcastle.info/)