Ok, this is what happens:
as soon as I have KW Rocketry and the KW community fixes installed, KSP starts, and loads until it gets to the first engine from KW, then it "just sits there" until I kill it with task manager.
Memory consumption of the process at that point is just a mite above 2gb, I'm running 32bit KSP from within steam.
As soon as I delete the KW folders from GameData, KSP starts again.
Link to my logfile is here:
https://www.dropbox.com/s/rw8ni631wvktzdp/output_log.txt?dl=0