@martin yeah I disconnected my external display and it worked. Maximum playable resolution for me was 1600x900 60Hz on my Full HD 144Hz display.
The models I enlarged, and are available somewhere on the forums, are also compatible with an exception that
smoke directories should not be overwritten.
I had to disable the 3D sound as it messed with my head. I heard some shots on the right but the shooter was on the left and so on.
Battles gave me an impression that better performance influenced the gameplay a little. E.g. on Midian the mighty wasps were overwhelmed by the not-so-efficient north forces alone.
I have to try out some campaign missions and compare the impressions as well.
Anyway, thanks a lot!