Good find. From that feldgrau board I found:
http://www.lexikon-der-wehrmacht.de/inhaltsverzeichnis1.htm.
I don't speak much German. 1 year in high school 35 years ago.
It has some good pictures:
http://www.lexikon-der-wehrmacht.de/Waffen/Bilderseiten/Unterbilder/7,5-cmPak40.htm
http://www.lexikon-der-wehrmacht.de/Waffen/Bilderseitenneu/MG42.htm
Free of charge.