Hey thats cool and is similar to my app. As far as I know your the only other app that can do this with an RPG mapping slant on things. Celestia & Worldwind seem close but with less editing features. Google and some other apps can do this with premade tiles but I think your still holding all of your parts in the original res right ? MapTool seems to do this as well but it seems to me that they hold the whole map in memory at once which is probably fine for what they want out of their app but is not quite the same.
So can you now put this city into a region and have several different cities like this and keep on going out with FM8 ? If so then you should put the Ansium tiles (our CWBP world map) into FM8 format. Theres a link in my sig to all the places and a tile overview.