import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,14,0))
w1=cq.Workplane('ZX',origin=(0,13,0))
r=w0.sketch().rect(44,24).circle(3,mode='s').finalize().extrude(-64).union(w0.sketch().segment((-6,-16),(6,-16)).segment((6,-5)).arc((8,0),(6,5)).segment((6,16)).segment((-6,16)).segment((-6,5)).arc((-8,0),(-6,-5)).close().assemble().push([(1,-1.5)]).rect(6,7,mode='s').finalize().extrude(36)).union(w1.workplane(offset=-28/2).box(6,20,28))