Use could also use the floor plan linked to the image above. Ask them to justify in writing why they would make these changes. When this assignment is finished, you could have the students present their finished product to the class, or simply post them up for the others to see. Some churches have all the pews one behind the other from the front to the back of the church. Other churches have a horse shoe or semi-circular seating arrangement.
Some churches have little boxes with a separation between the priest and the person confessing.
Others have confessional rooms. Some churches have small baptismal fonts. How is baptism seen differently in these two settings. Other questions can be used adapting them to the group you have.