import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-22))
r=w0.sketch().push([(8,5)]).circle(20).rect(18,20,mode='s').finalize().extrude(4).union(w0.sketch().segment((-44,-47),(-17,-50)).segment((-13,-21)).segment((3,-40)).segment((34,-14)).segment((34,-15)).segment((37,-15)).segment((37,-12)).segment((44,-5)).segment((14,-5)).segment((14,33)).segment((28,33)).segment((13,50)).segment((-37,7)).segment((-15,-18)).segment((-41,-15)).close().assemble().push([(35.5,38)]).rect(3,10).finalize().extrude(45)).union(w0.sketch().arc((-3,-8),(5,-12),(13,-11)).arc((6,10),(20,28)).arc((2,35),(-3,16)).close().assemble().finalize().extrude(45))