import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,3,0))
w1=cq.Workplane('XY',origin=(0,0,-12))
r=w0.workplane(offset=58/2).moveTo(71.5,66).box(57,12,58).union(w1.sketch().segment((-51,-61),(-30,-61)).segment((-30,54)).segment((-45,54)).arc((-71,47),(-51,28)).close().assemble().push([(-40.5,-4)]).rect(19,12,mode='s').finalize().extrude(-88))