import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-18))
r=w0.workplane(offset=-32/2).moveTo(-15,2).box(14,36,32).union(w0.sketch().segment((-45,20),(-21,20)).arc((16,20),(-15,40)).segment((-45,40)).close().assemble().finalize().extrude(-9)).union(w0.sketch().push([(9,-9)]).circle(36).push([(22,-1)]).circle(11,mode='s').finalize().extrude(68))