import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-16,0))
r=w0.sketch().arc((-50,20),(-35,20),(-20,16)).segment((25,16)).arc((-11,43),(-50,20)).assemble().finalize().extrude(31).union(w0.workplane(offset=32/2).moveTo(2,-11.5).box(96,63,32))