import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,18))
w1=cq.Workplane('ZX',origin=(0,-20,0))
r=w0.workplane(offset=-62/2).moveTo(-3.5,-19.5).box(43,3,62).union(w0.workplane(offset=-13/2).moveTo(9,34).cylinder(13,16)).union(w1.sketch().segment((23,-20),(44,-20)).segment((44,-7)).segment((44,0)).segment((44,13)).segment((23,13)).segment((23,0)).segment((23,-7)).close().assemble().finalize().extrude(-30))