import cadquery as cq
w0=cq.Workplane('YZ',origin=(11,0,0))
w1=cq.Workplane('YZ',origin=(20,0,0))
r=w0.sketch().push([(-28.5,25.5)]).rect(41,49).reset().face(w0.sketch().segment((-1,-7),(8,-7)).segment((8,-30)).segment((49,-30)).segment((49,2)).segment((8,2)).segment((8,-4)).segment((-1,-4)).close().assemble()).finalize().extrude(-16).union(w0.sketch().arc((-13,-41),(-2,-31),(-13,-40)).segment((-12,-40)).segment((-12,-41)).close().assemble().finalize().extrude(7)).union(w1.sketch().push([(15,30)]).circle(1).push([(15.5,29.5)]).rect(1,1,mode='s').finalize().extrude(-41))