import cadquery as cq
w0=cq.Workplane('YZ',origin=(-6,0,0))
r=w0.workplane(offset=-18/2).moveTo(1.5,-25).box(25,42,18).union(w0.sketch().arc((-63,31),(13,35),(-25,100)).segment((-25,31)).close().assemble().push([(23.5,-96.5)]).rect(79,7).finalize().extrude(30))