I am using this mod. Only the one Vertibird, Two different style doors used around the settlement and hospital beds in the clinic are used. Everything else is in game settlement items. The doors and beds are not seen in my photos. They are still WIP areas.
There is a bug or exploit, whichever you decide, that creates more space. Grab any gun(cheap guns mostly pipe pistols). Drop guns the more the better rate. Enter into Settlement build mode. You can scrap or store guns you have dropped. The game thinks they are part of the settlement and will erase space. This bug can be used many times. The problem is on consoles with limited memory space. It can be used but the larger your settlement the more likely the game will crash. Also the area starts to lag and frame rate drop.
One other thing. All items are scavenged. Just roaming the wasteland like a pro.