Here's some of my general feedback:
In general, I find that the documentation can be expanded upon a bit more, can you post some comparison tables maybe (inserters with speed horizontally, range vertically)? Ideally, each module could have it's own documentation topic or
wiki page
Core
I really like what you did with the stack sizes and chests. My iron smelting never runs out of buffer storage

Also, the inventory size is awesome.
Energy
Haven't really played with this yet.
Automatization
To be fair, I find the inserter section to be confusing, but that might be the sheer number of choices. Maybe it's the lack of documentation for the icons or maybe it's the categorization / ordering(how are they sorted/grouped?).
As far as I can tell, the number of arrows indicates the speed, the F or C indicates the side (far or close side) of a belt, but what does the color of the arrow mean (yellow, red, magenta)? Range?
Transport
Haven't really checked this out yet. I suppose with the extra steam engines the copper and steel pipes are necessary because they vaporize liquids faster.
The number on the icon, is that the maximum distance?
Trains
Electric trains are looking awesome, but haven't really played with them yet. I will post my findings when I use them!
Mining
Same here, will check back when I played with them.
Logistic
Not using robots in my campaign yet. But I suppose MK2 upgrades the robots(better speed/capacity) / roboport(more loading bays, better range) to be 100% better in most if not all aspects. Are the different robot versions interchangable with different roboports? If the roboport MK2 isn't charging 8 robots at a time, is that because it's not possible?
Decoration
Meh. Haven't found a use for this yet. Aside from the floors and letters, it would be awesome if you could find a use for the statue / flags. Maybe the statue could act as something the biters like to attack more(like the radar) and the flags could be... no idea. Other then that, if the deconstruction planner could NOT pickup the floors, that'd be awesome. But yeah, I suppose not
EDIT: Do you have a need for dutch translation? If so, where do you have your git repo

I found yours on github, but I think that one is out of date.