import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-40))
w1=cq.Workplane('YZ',origin=(-20,0,0))
r=w0.sketch().push([(-82.5,25)]).rect(35,24).rect(13,4,mode='s').finalize().extrude(33).union(w1.workplane(offset=120/2).box(112,168,120))