Dare I say that you have my attention. Looks like quite the ambitious project you have here, mind if I'm a part of it?

I particularly enjoy open sandboxes, and have some ideas for possible locations... map help is beyond me, sorry (I'm a general kind of guy, specifics send my head spinning). If you're looking for a name, I can suggest those, but it would depend on how the city would end up lookin'. Big name city with tall buildings like New York? Something that pops and sounds fancy, like Verelle, Iambic City, or St. Navarro. Justatown? Something plain, like Saxton or Southwick or Bricksvale. Industrious boom town choked with smokestacks? Make it sound like it relates in a way like Eastport, Marquee, or Central Junction. Dilapidated hellhole? Rotterdale, Blackwood, Crampton, or something shady like that. 

Cities I can name all day. Feel free to steal what you want from the list or ask me for something else. I can also give very [i]general[/i] help with the map, such as interesting locales and around where they should be in relation to each other, maybe in what cardinal direction, but nothing with drawing tools.