I built some premade sections out of the set. I first reduced all textures to 512x152 to optimize renders. I then created all sections, intersections etc. Each section I then exported as an obj, reimported it then applied materials and saved as props. Now all I do is load up a hall section or doorway section or turn or intersection and make whatever halls and rooms I want. Much easier than dealing with 40 figures in your scene. It takes maybe a slow ni9ght to do this but well worth it.