Waterbury Freight House: 2 - One story "new" freight house

I've gotten the basic styrene shell assembled for the one-story "new" freight house at Waterbury. The sub walls are .060" with .040" Evergreen clapboard siding on the exterior. Before installing the clapboard I run a piece of fine grit sandpaper over it in the direction of the clapboard. This "breaks" the surface, adds some fine "wood texture" and seems to make the paint adhere better since the surface has some tooth. 
Here's a couple of pictures of progress. Next step is to get the first coat of paint on the styrene. 

The freight house with the basic door and window openings in place on the layout. 

The building won't have a full interior, but I wanted to include a suggestion of the freight agent's office since it would be visible through the windows and the partially opened freight door. I also plan to add some simple interior lighting to this building. I attached the agent's office walls to the sub roof, added a door and some wainscoting. The interior detail here will be simple shapes to suggest a desk, file cabinet, and shelves, and perhaps a figure. 

The floor is scribed styrene sheet (scribing is on the other side in this view). The floor will not only be visible inside one or to of the open doors, it also acts as a brace, stiffening the entire structure. To get the floor at the correct level, and to further stiffen the floor, I used strips of .060" styrene.