Workbench is now connected with castle workbench in v3.
All the credit goes to SingABrightSong!
Thanks mate.
UPDATE
Added clean version, all stuff and quest triggers are removed.
In version 2 is removed General and Sarge. Use suggested mod but be careful because you can delete base wall or some trash under some pipe or who knows what that can't be scraped. Use quick saving before you scrap anything.
I suggest this mod for scraping in Tunnels: http://www.nexusmods.com/fallout4/mods/5320/?
Warning:
Don't use this mod if you are not finished "the artillery minutemen quest".