First things first.
Immediately after I took over, I arranged for interior accomodations, energy, water, food, and assigned a caravan to get the settlement hooked up on my logistics network.
I'll show the interiors later.
Next thing: I started with the breach in the northern wall and reconstructed it to be a guarded gate. I call that the "North Building".
1st floor: guard room
2nd floor: SS2 interior security office plot
3rd floor: don't know, ye