The back wall is made from foam. I use that a lot for brickwork. First it's carving the bricks and cutting the window and door holes:
Then applying paints and effects.
The window and door came next:
Overall I'd rate this brick wall as average in terms of resolution, but it will be partially obscured and fade into the background once the scene is complete. The door and effects and the finished window will transform the way it looks in the scene.
The door will get a two-tone chipped look. It starts with a darker undercoat:
Next: Finishing the door