Yes. it's a port-a-pot. This package has two, one with the open door to allow viewers to your layout to get a full view of however you decide to add it to a scene.
Some loose powder material may have to be manually cleaned prior to painting. I generally use $1 craft acrylics for this material and am happy with the results, at least to the limits of my mediocre painting ability. Because the material is slightly porous, thin paint may bleed through the material. Some people use some type of filler on flat surfaces to give it a smoother look. I've used regular spackling compound that I scraped with a styrene scriber after it had partially dried.
The computer rendering shows the details in the interior of the model.
I also offer a port-a-pot made from a UV cured resin material. The nylon material is a little coarse in texture, but less expensive. It depends on how close people will be when viewing the model.
The arrive unpainted and connected by sprues. They should be separated by carefully cutting the sprues with a quality cutter. I have included a picture of a painted model, and yes, painting the interior was as big a pain as it looks, but you will have a rather unique item that I cannot find offered by any other manufacturer.
For more information on my use of the 3D printing process for HO scale railroading and links explaining cleaning and painting models go to www.dcyale.com/3d.html.