Just checking in to see how this project is going. I have a home listing in the area, which it sounds like we did a very similar thing on. If you need any assistance still, or an experienced contractor for the job and a competitive bid, feel free to contact me.
Keller WIlliams Realty
Not many of us are contractors, but when I was working on my home the cost to add a second story was twice what it cost to add on on the first floor. I would advise that you call a contractor for an accurate price for this type of work. By the way, most homes require foundation work in order to support a second floor.