Jorrit,
Thanks for this terrific write up and the resources. It¡¯s timely as I¡¯m about to tackle this project myself in my 2003 GLS. I¡¯m still considering, however, possibly going with the full dash removal to address replacing the heater core and maybe wiring for a new audio/media solution while I¡¯m in there too. You¡¯ve given us another option, so thanks for that!!
cheers /paul
Paul Lothridge