import cadquery as cq
w0=cq.Workplane('YZ',origin=(2,0,0))
r=w0.sketch().push([(29.5,0)]).rect(41,16).push([(16,-18)]).circle(4).finalize().extrude(-26).union(w0.sketch().segment((-43,-20),(-38,-20)).segment((-38,-33)).segment((-7,-33)).segment((-7,-44)).segment((39,-44)).segment((39,9)).segment((35,9)).segment((26,-1)).segment((19,7)).segment((21,9)).segment((7,9)).arc((4,17),(0,24)).segment((0,31)).segment((-6,31)).segment((-6,44)).segment((-38,44)).segment((-38,31)).segment((-43,31)).segment((-43,24)).arc((-50,5),(-43,-14)).close().assemble().finalize().extrude(21))