Thanks, Ray....
Well, one of the main anchor pieces remaining is the Cornerstone Merchants Row I section. I have been looking for this piece in the LHS as well as eBay, and finally found it locally for a great price. I bought some paints from the LHS as follows: All paints are Floquil -- Mineral Brown (for the side walls), MKT Green (for the accents), Reefer White (for accents), UP Armor Yellow (for accents and brick color -- have to have the UP colors, you know), and then ATSF Red (for the door accent color). Having used many other color manufacturers, I must say that the Floquil is very easy to use. I undersprayed the entire model with a base of flat gray spraypaint (can) specifically designed for plastic. I let this dry, and found that once I had done this, the Floquil painted very nicely in an even coat -- My previous experience without the underspray was that the paint had a hard time sticking to the plastic. And no, I'm not using any fancy airbrush for the paint -- all is by hand with brushes. I found the Floquil literally flowed nicely over the surface area and was easy to work with, no thinning required.
Here are a couple of pictures of the various panels being having been painted, but not assembled.