import cadquery as cq
w0=cq.Workplane('YZ',origin=(35,0,0))
r=w0.sketch().push([(37,3)]).rect(26,52).push([(37.5,2.5)]).rect(15,23,mode='s').finalize().extrude(-70).union(w0.sketch().arc((-40,17),(-45,-18),(-11,-25)).segment((-11,-18)).segment((-24,-18)).segment((-24,-4)).segment((-11,-4)).segment((-11,6)).segment((-1,6)).arc((-15,20),(-35,20)).segment((-35,17)).close().assemble().finalize().extrude(-37))