Plan the ring in threes. One craft makes three walls, and the calculator shows it the moment you ask for one: two left over. Walk the line you want to close, count the sections, round up to a multiple of three, and keep the spares in a box for the first wall a raid takes down.
The stones are just farming. The sheet metal is the limit. No bench crafts it, whatever the unfolded calculator says about high quality metal and scrap; every sheet comes from crates, road loot or recycled heavy plate armour. It is the same sheet a battering ram asks for, so settle early which one your group builds first.
Watch out
Don't recycle spare walls. The recycler gives back stones, but the sheet metal only now and then.
The stone gate closes the last gap, and owners of the Adobe skin get Adobe walls from this same craft.
Questions
High External Stone Wall ×10: how many resources?
Sheet Metal ×4, Stones ×16,000.
Which workbench does High External Stone Wall need?
Workbench level 2.
How long does High External Stone Wall take to craft?
25 s for one, every step included.
How much scrap does researching High External Stone Wall take?
