It has a map.rwm because I made changes to the descr_regions. The mod will not work unless you have a map.rwm generated with the new descr_regions.txt, so I added a map.rwm just in case somebody would forget to delete their own before running the minimod.

If you added a hidden_resource with the name "royal_barracks" and then required it for recruitment, it could work just like any other HR. I don't know why you would name the HR as such, though that doesn't matter. (Don't forget to add any new HRs to the list at the very top of the EDB.)

The campaign map looks just like any other v1.0 game except certain cities cannot get beyond certain sizes. I personally don't have a game on this minimod in v1.0 so I can't post any screenshots.