Thanks for the replies. The floor does have more stains than do show up in these pictures. The walls could use some too, but there are a few.
I like working features, and being able to access the interior easily. The roof is removable.
Here's how the wall fan really works: I made a little fan from styrene...
Mounted it on a motor from an old personal casette player like a walkman...
Built a scale looking motor and mounting frame
put some screen in behind the fan to hide the motor
Mount it in the wall, with the real motor sticking out the back. I don't have a picture of it from behind.
It's a 4.5 volt motor. I run it on 1.5 volts to give it a realistic speed. In the picture it looks like a blur, but you can see which way it's rotating when looking at it in person.