Here's a tidbit I discovered a while back. If one looks at proportions, a WWII era GI Joe doll had 12" biceps. A modern GI Joe has 16" biceps. (for reference, an actual average is a tad over 13", Arnold was 22" in his prime, Markus Rühl was 24" when he was competing)Regarding bone structure, take a look at photos from the 1930's or earlier. People were rail thin compared to today...
As to the stench. It depended on the type of warfare and theater. The Germans were pretty good in adminstering the individual burials and there are over 800 WWII Wehrmacht cemeteries around Europe, North Africa and even the US (POW camps). The Soviets had mass grave sites but a lot of the dead bodies were just left there to rot. Americans had burial companies, as could be witnessed around the Normandy beaches (Spielberg can be far too sentimental but that opening scene in SPR was pretty powerful).