Because of the way the sides are built, the windows have to be made and installed individually. I built these up using a piece of colored cardstock to represent the shade with a strip of silver tape at the bottom. The shades are glued to the clear styrene window with some double stick craft tape and the window glued to the inside walls with the same craft tape. The venetian blinds in the lounge area are decals from Circus City.
From color pictures I found of a similar C&O car I think the interior colors are close to original although I guessed at the carpet colors.
Roof with GRJ's LED lighting strip:
The lighting power board is neatly tucked away in the kitchen:
Ken