Like Belu5, original mod author has written: 'A small courtyard blocked in directly North West of the Rivet City Carrier.'

RCOS - Rivet City Outskirts Version 1.0

Changes:
- Only one, opened entrance
- Added 3 traders, weapons/armor, medicine, misc
- 3 wastelanders and a dog
- 5 guards, 3 day time, 2 night time
- Camper for player, workbench and place with nice view
- Take a look on screenshots

  All NPC's have basic sandbox(sell-sleep) and patrol packages. There are 2 esp files, use ONLY ONE depending have, or have not FWE. Moved alternate start shack and marker from the courtyard.

Resources used, listed under Fallout 3 Nexus Modders Resources and edorsed for it's author hard work:

Rivet City Outskirts Modders Resource - https://www.nexusmods.com/fallout3/mods/19107