Not relevant at the moment perhaps, but a tip:
don't model small details like:
- windows & windowsills
- "luftgitter"
- small accessplates
- number or textshields
- doorhandles
and other parts like that.
These parts can easily be done with texturing/normalmapping and makes those parts more
controlable for texturing & weathering. Sometimes, modelling those parts separately prevent
possible repaints. Furthermore, as a bonus, it saves you some (if not a lot of) polygons.
As far as I know the DET 1-2 only had a Saxon and the RVT livery, but a fictional DRG-livery would be nice as well.