import cadquery as cq
w0=cq.Workplane('YZ',origin=(0,0,0))
r=w0.workplane(offset=-15/2).moveTo(-30,18).cylinder(15,20).union(w0.sketch().segment((-4,-21),(19,-25)).segment((19,-38)).segment((28,-38)).segment((28,-27)).segment((22,-25)).segment((47,-29)).segment((50,-10)).segment((28,-7)).segment((28,6)).segment((19,6)).segment((19,-4)).segment((25,-6)).segment((0,-2)).close().assemble().finalize().extrude(-8)).union(w0.workplane(offset=15/2).moveTo(-16.5,12).box(41,16,15))