import cadquery as cq
w0=cq.Workplane('YZ',origin=(-20,0,0))
w1=cq.Workplane('XY',origin=(0,0,9))
r=w0.workplane(offset=8/2).moveTo(36.5,26).box(27,2,8).union(w1.sketch().segment((-11,-26),(-9,-26)).segment((-9,-50)).segment((41,-50)).segment((41,-20)).segment((24,-20)).segment((24,-9)).segment((0,-9)).arc((-38,3),(-11,-26)).assemble().push([(-25,-21.5)]).rect(4,9,mode='s').finalize().extrude(-36))