sorry, i forgot about the relative paths. i have uploaded it again. i also renamed the old zippers and set them to ignore since they caused engine warning messages.
thanks for fixing the fog problem!

yes, i think the bumps aren't too bad. i tried to avoid modeling the conveyor belts into the track. i didn't just want to use a different texture but have some metal casing around it and this would have been quite cumbersome to do. i also always try to stay as non-destructive as possible. it's better if they still can be moved around.