import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,6,0))
w1=cq.Workplane('XY',origin=(0,0,21))
r=w0.sketch().push([(21.5,5.5)]).rect(57,55).reset().face(w0.sketch().segment((7,5),(19,5)).arc((21,3),(24,5)).segment((35,5)).segment((35,7)).segment((24,7)).arc((21,9),(19,7)).segment((7,7)).close().assemble(),mode='s').finalize().extrude(-9).union(w1.sketch().segment((-33,-18),(-25,-18)).arc((-10,12),(23,9)).segment((23,18)).segment((-33,18)).close().assemble().finalize().extrude(-71))