Finished the outer stair, added the first windows and attached the stair to the building today. I finished masking the outside stair and painted the brown trim. Then I masked that and started working on the tin roof. This picture shows the entire sequence starting with 1) painting the brown trim. 2) a coat of Tamiya Burnt Iron which gives a good old metal look. Then 3) I took it outside and did a glancing low-angle Tamiya rattle-can Bare-metal Silver to give a brighter look to the high spots, but leave the dark brown in the trenches. Finally 4) I used rust weathering powder followed by direct application of Vallejo Shadow Flesh which is a great rust color. I dry brushed this to collect the corrosion at the lower edges of the roof slopes.
The roof looks about how I expected it should look. I left the wall color the Tamiya Gray Primer and it needed to be toned down a bit so I used AK interactive dark gray wash. It looks frightenly awful when you're putting it on and you think, "Oh good lord, what the heck am I doing to my beautiful work?" But, after you wipe it down, it works out pretty well. You just have to have faith like Indiana Jones stepping off what appeared to be an abyss in the 3rd Raiders movie.
Here's the finished weathering. Not too much, just some wear and tear.
