import cadquery as cq
w0=cq.Workplane('YZ',origin=(-5,0,0))
r=w0.workplane(offset=-45/2).moveTo(10,22.5).box(36,37,45).union(w0.sketch().segment((-9,8),(4,8)).segment((3,3)).segment((7,2)).segment((9,8)).segment((29,8)).segment((29,29)).segment((15,29)).segment((16,34)).segment((12,35)).segment((10,29)).segment((-9,29)).close().assemble().finalize().extrude(6)).union(w0.sketch().push([(-36,-26)]).circle(1).reset().face(w0.sketch().segment((-5,-31),(8,-41)).segment((20,-24)).arc((24,-21),(25,-17)).segment((37,0)).segment((23,10)).segment((11,-7)).arc((8,-10),(6,-14)).close().assemble()).finalize().extrude(55))