I like this a lot. It's almost like two buildings for the price of one. Even the crankiest internet critic would have to admit they've gone to great lengths to differentiate the two sections. The only way you could do more would be to vary the heights and the heights of the levels.
I also like how we aren't betting the entire farm on that rusted cladding. Even if it ends up looking great I'm still inclined to think less would be more.
So what would the white stuff be?