Panzer Battles: Stalingrad City Map Available for Download
This is a map of the full city that I created using the editor awhile back. I traced a WWII German army map to make this. It is sitting in my game folder basically unused (except for my "Paulus Attacks" scenario slice of it). If you want to try your hand at the in-game editors for Kursk I encourage you to use it! I would love to play a Stalingrad scenario or two!
After having traced this, I do think the current Panzer Battles scale at 250 meters per hex is wrong for Stalingrad. If I were going to do a proper game for Stalingrad, I would recommend a 125 meter per hex scale. I just don't think the larger scale does justice to buildings like the Tractor Works or Red October, etc.