import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-30,0))
r=w0.workplane(offset=55/2).moveTo(-2,32).box(50,36,55).union(w0.sketch().arc((21,-36),(26,-31),(25,-24)).segment((22,-30)).arc((-18,-29),(21,-36)).assemble().finalize().extrude(61))