import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,29))
w1=cq.Workplane('XY',origin=(0,0,50))
r=w0.sketch().segment((-42,-26),(-9,-46)).segment((35,26)).segment((2,46)).close().assemble().finalize().extrude(-79).union(w0.workplane(offset=-71/2).moveTo(21.5,15.5).box(41,55,71)).union(w1.sketch().push([(-6,35)]).circle(7).circle(1,mode='s').finalize().extrude(-31))