What is it going to cost me to gut and remodel my duplex?

[Jayme Carlson]

I've worked in construction since I was in high school so I would like to tackle most of this myself, just maybe not the gutting. But I've always been the laborer and therefore mostly oblivious to the costs. So I'm looking for some general numbers here of what it's going to cost me. Per SQ/Ft numbers are fine. 

It's a 2 story house built in 1890 and converted to a duplex in the 80's (I think). I'm pretty sure it's balloon framed. I plan to gut it down to the studs, removing plaster and lath, with drywall over the top. Remove the windows, electrical and plumbing also. I'm guessing I will have to do some framing to shore up the flooring. Then all new subfloor, electrical, PEX plumbing, drywall, windows, carpet and hardwood flooring, kitchen cabinets, bathroom fixtures, ect. 

What should I expect for costs per SQ/Ft? $30? 50? 100?

Located in North Central Illinois.