Dang, all of that looks fucking sick, as usual from you ravage :0 one thing that bothers me is the halogen lights under a wooden walkway on Brazil, those lights tend not to be used outdoors. A single bright bare bulb maybe?
I think I map the same way Ravage described above. I have an incredibly hard time making a map just out of shapes - I always think about what this building is going to be, how it's going to be detailed, if it makes sense in the story the map is trying to tell, what's over that fence, why is the truck here and not elsewhere, are the doors I justmade usable in an industrial scenario, etc. The only map I've made so far out of just shapes was theprestige I think, and I'm not at all happy with that geometry. On the other hand, getting stuck on a certain idea for a map can also be bad - that was my main problem with advection. I had set in stone that b would be a train station and c some sort of loading dock that I completely locked out any creativity that could have saved the shitty parts of the map (most of them).
Map however you want though, as long as your detailing makes sense. I don't know process and ergo don't know what the door looks like exactly, but it just sounds like isolated detailing - detailing made for one specific spot that doesn't necessarily fall together with the rest of the map, architecturally or thematically.
Edit:that isn't Brazil with the halogen lights, just realised