import cadquery as cq
w0=cq.Workplane('YZ',origin=(-10,0,0))
w1=cq.Workplane('ZX',origin=(0,-5,0))
r=w0.sketch().push([(-16,15.5)]).rect(28,29).push([(-4,8.5)]).rect(4,3,mode='s').push([(24,-4)]).circle(26).finalize().extrude(47).union(w1.workplane(offset=-45/2).moveTo(16,-17.5).box(24,37,45))