I am playing as a Minutemen Liberator and have taken the Castle. Here is my experience making the Castle an Outpost:
(1) After performing the Minutemen settlement quest for Ten Pines; setting up Red Rocket as an Outpost; and vassal assaulting Abernathy, Sanctuary and Starlight, I should have had 5 settlements. Used the console command "show MinutemenOwnedSettlements" and the number of settlements was 0. Thanks to
@Bored Peon on Steam, I could use the console command "SetStage <QuestID> <Quest stage number>" or "setstage 3a457 20" to initiate the Castle quest.
(2) The Castle (No Prebuilt, No Preconquered, Outpost)
- started the quest using console command - setstage 3a457 20
- ISSUE 1 - took 3 tries to successfully assault, because the first 2 times, Preston was standing in the wall breach where the Queen comes thru and was incapacitated - due to Conqueror my only option was execute Preston versus use stimpack to heal. The third time, I waited at the corner of the Castle and when the Queen came out of the lagoon, used a Fat Man
- ISSUE 2 - because Preston's home settlement is Sanctuary a vassal, he can not be assigned to the Castle which is an Outpost. For those who tire of his dialogue this may be ideal.
- ISSUE 3 - after taking the Castle, the game has vanilla type Minutemen "showing up" periodically. With Conqueror, they are listed as civilians which effects the morale calculation - there is always the console commands of "disable" and "markfordelete"
Hopefully this is of some help.
huh, everything went fine for me no console cmds were needed.
Preston was fine.
I did everything vanilla first.
In the basement after the fight with Sarg, I added my castle mod. "While still in the basement."
Then I made the war desk.
Converted to an outpost.
Made it my main Base.
Made Ronnie the Commander.
I do have all the types of settlements one can have?
Vassel
Outpost
Vanilla
Prebuilt and Faction occupied. in my game all other factions are "hostile"
So, in my game, I don't know what all gets counted to trigger Preston, but he triggered after I turned in an early quest for starlight to retake the castle. Oddly, the game gave me that one, not Preston or a Settler. Maybe the faction pack, it just kicked in while I was running around?
The faction pack was installed at the start of the game.
All things conqueror were working at the Castle, but the map marker remained as a cannon vs the typical outpost symbol.
Then making it an outpost at the war planners desk it asks you If:
If you want to make it an outpost and If you want to make it your HQ.
At least that's what happened for me...