Boilermaker is right on. The Pecos river became part of Korber when I owned it. These modern TT line parts are great. Forum member laid off sick made a very nice version for his layout using these parts.
I checked it out and that korber is nice but at 39" long and 9" tall its way to big for what i am looking for.
The great thing about that series of kit is that it is actually made up of a number of modules. The modules are about 2" wide , so you can make the kit to any length or width you want. In addition there are two heights of the modules, that kit has the taller ones, but there is a set that is shorter
Here is a image that has all the modules in the series. You could figure out which ones you need and call Korber Models and they would sell you the combination you need. They also have the injection molded window and door inserts if you need them. The large opening for the trains are made using the short 3" modules at the top.
The simplest way to make the roof is styrene, or cut 1/8" Masonite you can buy at Home Depot or Lowes, or use black Foam Core you can buy at Hobby Lobby or the like. The foam core is the simplest and easy to cut, but does not deal well with water so be careful if you like to glue fine ballast to the roof of your models to simulate roofing granules using white glue.
This is a top view of the model that shows the number of modules used. You can see from this how it can simply be shortened to accommodate a different space.
Here are some other photos showing what you can do with these modules.
Here is how the modules glue together to make the walls - note the bracing on the backs for support, and a small lip on the inside to hold the roof just below the top of the walls
Here is a foam core piece being installed for the roof
All the roof top vents and AC units/ heat exchanges are also available from Korber.