import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-18))
r=w0.sketch().arc((-50,42),(-45,39),(-49,43)).segment((-49,42)).close().assemble().finalize().extrude(-3).union(w0.workplane(offset=38/2).moveTo(34,8).cylinder(38,16)).union(w0.sketch().push([(4,-1.5)]).rect(70,85).push([(4,-1)]).circle(20,mode='s').finalize().extrude(39))