import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-28))
w1=cq.Workplane('YZ',origin=(-26,0,0))
r=w0.workplane(offset=-4/2).moveTo(-4.5,15).box(17,70,4).union(w1.workplane(offset=52/2).moveTo(-32.5,0).box(35,100,52))