Austrains FO in 20+ Pieces

I bought a 2 pack of Austrains CCA FO in Tuscan and Russet passenger car pack . I want to change the roof colour , paint the end platform underneath the roof white, decal the body then heavily weather it. I don't like masking so I thought it easier to pull apart and paint each individual piece. The interior colour can be changed passengers added and open windows . The under carriage can also be weathered . Here is an exploded view before I start the painting (its raining outside) not good for airbrushing.