I have the Roco model of the Kombiverkehr Rollende Landstrasse coach Model number 45474 DB-AG

I wish to fit interior lighting and fit passengers but before I do that I would like to paint the interior with some correct colours as the interior is only in a dark brown plastic, I have tried to find some detailed pictures of the interior but had no luck so far, if anyone could help with my search I would be most grateful.

Radfan