Get ready for Mark H. Walker's Lock ‘n Load: Heroes of Stalingrad. This is the first complete computer game in the Lock ‘n Load series, covering the battles in and around Stalingrad during World War II.
I don't have the LnLFH maps with me now, but ithink they are something like 35cm x 22 cm (about). And yes, they are geomorphics (you can combine them).