From the description that you provided, the Jeep looks to be a 1952 or '53. The first two years of production had the hinges on the grill. The main rust problem areas are the floor, the fuel tank well under the driver's seat, the passenger side tool box, and the battery compartment in the cowl. I will share some photos of a A1 that I had the pleasure of working on. This one was a worse case scenario, as far as rust was concerned. You'll get the general idea of what to look for. The last picture is of the final product. I did all the floor and metal work, then the final body work and paint was done by the owner. Pelago is just finishing up his A1, and he can be found in the restorations section of this forum. He has done a great job covering his adventure on his Jeep. He tells the highs and the lows of being a one man show.
Included is a link to a kind of a one stop point of information to help figure out what year you are looking at;