Hello,
I have written a style guide and some background information for my Astra Militarum faction.
You can read it here. It is loosely informed by the Soviet Union and also House Harkonnen from Dune.
This is an early draft version of a document I originally only intended for myself. Rather recently I got the idea to try and polish it up a little bit so that others could read it and make comments.
Let me know what you think; there's much room for improvement, I think.
Thanks!