As I recall, and please correct me if I am wrong, the subject of new Chapters/Warbands/craft Worlds/Legions is a non-issue. At this time no new ones can be added. Little cosmetics added to existing armour for factions can be added. The only criteria is that it has to be approved by Behavior and or GW. I personally find this to be a shame, but totally understand from a legal perspective. Custom Chapters/Warbands/Craft Worlds/Legions would be very beneficial to the community and the game in general. The Steam Workshop and all that can be done, will hopefully be very good for the game though.