Since i saw your Distant Worlds Universe | Let's Play - 01 - Honorverse series on youtube, and then read the series my self, i keep thinking "how to mod it like honorverse"?
Well, certanly it will require a lot of modding.
First the easiest part is change the races profile pics in the theme. All will look similar but the "rules" will be different.
Second, change the name of the races. Wich is hard bc many txt files will be modified. I think with the editor (the program) this can be done somehow faster and easier. But it's a lot of work.
Third: edit the research, component and racebias txt. to form the "background" that makes Honorverse wath it is. A lot of work here.
Missiles will have larger range and speed. No rail guns, lasers are fine, Point defense engage against fighters/bombers, but not against missiles, so thats a problem. With race policies it can be delimited wich tech will be investigated by other races. (maybe everybody investigate the same weapons?)
The real problem is the IA. It sorrounds the enemy target when attacking. In the honorverse the fleets forms the "Walls of Battle" wich alows to the exchange of missiles from the long distances. That wont happen in DWU.
I wish i can have enough time and knowledge to actually do this kind of mods. It will be awesome.