I finally finished this project; it had been in various states of completion since I started it.  The inspiration came from a photo I found online from James Lalande (posted here with permission.)  The flatcar and tie handler are not exact matches, but capture the look of the prototypes.  The flatcar kit is from Red Caboose.  It had the stake pockets as separate castings, which made leaving some off very easy.  Wire loops were added for the tie downs.

I was looking at different ways to do this building.  What to paint first, how to mask, etc. Having found this tape earlier, I thought I would give it a try.  The tape is just sticky enough to stay in place, but came off really easy.  I used my chopper to get nice 90 degree corners and consistent tape length.  I painted everything red first, then masked the brick by cutting tape and overlapping.  The edges of the cement of the building make great guides for the tape.  All in all it worked great with very little under-spray to touch up afterwards.