import cadquery as cq
w0=cq.Workplane('YZ',origin=(10,0,0))
r=w0.sketch().segment((-12,-49),(-8,-49)).segment((-8,-50)).segment((8,-50)).segment((8,-49)).segment((12,-49)).segment((12,49)).segment((8,49)).segment((8,50)).segment((-8,50)).segment((-8,49)).segment((-12,49)).close().assemble().finalize().extrude(-44).union(w0.workplane(offset=23/2).box(60,34,23))