import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-11,0))
r=w0.workplane(offset=-28/2).moveTo(43,39).cylinder(28,7).union(w0.sketch().segment((-32,-26),(3,-26)).segment((3,-21)).segment((-28,-21)).segment((-28,10)).segment((-32,10)).close().assemble().finalize().extrude(21)).union(w0.sketch().push([(-20,-20.5)]).rect(60,51).push([(-20,-20)]).circle(17,mode='s').finalize().extrude(50))