I did this research not long ago (live in Toronto) and settled on Ribtrax. (Just ordered recently) Check out Rick's site for some info on what it's like to live with in Canadian winters:
https://www.radgarage.ca/floor.html
Nice. Would be interested to know why you're going with white metal panels on the inside. I'm undertaking a build now and was leaning towards plywood (over say drywall). My space is much smaller though.
Look forward to pics.
Welcome. How common is it to have a garage you can park in in Chicago? I'm in Toronto and most people here aren't parking in garages - typically it's either on the street or on a small parking pad in the front yard.