[ RM13 combat armor (on) construction.

Construction Source Result
Build Metal Bars . floor " metal bars
Build Metal Wall 0 shallow pit # half-built simple metal wall
Build Metal Wall # half-built simple metal wall LINE_OXOX simple metal wall
Build Reinforced Concrete Wall 0 pit # rebar cage
Build Concrete Column 0 pit # rebar cage
Build Metal Roof . simple metal floor
Build Concrete Roof 0 shallow pit . small rebar roof cage
Build Reinforced Concrete Roof 0 pit . rebar roof cage
Build Standing Tank O standing tank