I get the impression from various photos of airfields that they tended to be more one-sided than in RB3D.
Large field on one side (the bigger the better), tents or hangers or sheds or whatever on the edge. Behind the line of tents a convenient road. Then somewhere at the next town a chateau for quarters.
I have in front of me Over The Front vol.9 #3 which has an article on JG2. The fields beyond the aircraft in the photos seem to be flat to the horizon and the 'hangers' range from tents to quite substantial wooden structures.
It does seem to be a case of whatever was available or could be assembled quickly.
Good luck on your diorama.