JacobPaul81,
For a more "Deco" look, I'd return to the White porcelain effect of the tiles on the face of your bus depot. I further believe that a lighter color for trim (light blue, yellow) would enhance the effect unless you are after a gritty, urban, past its prime business. Although not a bus depot, like yourself I was after a '30s Art Deco look for my restaurant. I spray painted the "tiles" high gloss white and brush painted the brick surfaces yellow.
As someone previously recommended, Squadron White Putty is very useful for filling cracks, fissures, porous casting holes and similar casting flaws and construction errors.
