That's an easy build, and even if it is completely useless it was fun to do.
I had to do a few changes due to parts that didn't exist in dark bluish gray:
- front doors replaced by bricks+panels
- 2x2 macaroni bricks replaced by facet bricks
- use old dark gray for side door hinges
This build was suggested to me because a few years ago I bought a few secondhand 5550s as they were easy to find and cheap, and just replaced the black & yellow lines by other colors: photo on Brickshelf.