Instructions for building the fortifications:
Military Nest: 20 empty sandbags, 15 wooden planks
Concrete Bunker: 10 cement bags, 20 scrap metal
Door Barricade: 5 wooden planks, 20 nails
Window Barricade: 5 wooden planks, 20 nails
Dragon Tooth: 2 cement bags, 5 scrap metal
Hedgehog: 1 dismantled hedgehog + wrench (wrench kept)
Razorwire Fence: 1 wooden log, 1 barbed wire
Concrete Road Barrier: 5 cement bags, 10 scrap metal
Long Sandbag Fence: 10 empty sandbags, shovel (shovel kept)
Round Sandbag Fence: 10 empty sandbags, shovel (shovel kept)
Wooden Watchtower Part: 20 wooden planks, 40 nails
Wooden Watchtower: Two parts
Hesco Barriers cannot be crafted, only found.
Craftable parts:
Disassembled Hedgehog: 3 scrap + 3 scrap
Scrap Metal: 5 metal ore + 5 metal ore. Metal ore can be obtained from traders.
Breaking down items:
With Hatchet:
Military Nest, items returned
Door/Window Barricade, items returned
Sandbag Fences, items returned
Wooden Watchtower, items returned
Hesco Barriers, kit returned
With Pliers:
Razorwire Fence, items returned
With Sledgehammer:
Concrete Bunker, nothing returned
Concrete Road Barrier, nothing returned
With Crowbar:
Hedgehog, items returned