3 pair of steel knuckles construction.

Construction Source Result
Build Improvised Shelter 0 shallow pit # improvised shelter
Build Wattle-and-Daub Wall # half-built wattle-and-daub wall
Build Wattle-and-Daub Wall # half-built wattle-and-daub wall LINE_OXOX wattle-and-daub wall
Repair Wattle-and-Daub Wall & broken wattle-and-daub wall LINE_OXOX wattle-and-daub wall
Seal Crate O open crate X crate
Seal Coffin O open coffin 0 coffin
Dig Grave and Bury Sealed Coffin 0 coffin # grave
Build Road Barricade # road barricade
Build Junk Metal Barrier 0 pit LINE_OXOX junk metal barrier
Reinforce Junk Metal Wall using bolts LINE_OXOX junk metal barrier LINE_OXOX junk metal wall
Build Junk Metal Floor LINE_OXOX junk metal floor
Build Pine Lean-To 4 pine tree ; pine lean-to
Build Tarp Lean-To is:DIGGABLE, FLAT ; tarp lean-to
Build a bellow. is:FLAT # blacksmith bellows
Build a drop hammer. is:FLAT # blacksmith drop hammer