import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,18))
w1=cq.Workplane('ZX',origin=(0,10,0))
r=w0.workplane(offset=31/2).moveTo(48.5,-4).box(3,22,31).union(w1.sketch().push([(-17,-18)]).circle(32).reset().face(w1.sketch().segment((-28,-33),(-1,-33)).segment((-1,-20)).arc((7,-9),(-5,-16)).segment((-28,-16)).close().assemble(),mode='s').finalize().extrude(5))