I have some vague plans to create a few 15mm scale German tents for a little airfield on the future North African table and I stumbled across www.tentsmiths.com, a US company that makes full replicas of various tents of the ages, including WWII period tents.
And www.zeltbahn.net is an entire site dedicated to detailing the standard WWII German troop tent or ‘zeltbahn shelter quarters’, although it’s lacking in decent photos! Fortunately Google image search turns up a few.