import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,27,0))
w1=cq.Workplane('YZ',origin=(-32,0,0))
r=w0.workplane(offset=-30/2).box(70,100,30).union(w1.workplane(offset=12/2).moveTo(-18,-15.5).box(18,3,12))