import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,10))
w1=cq.Workplane('XY',origin=(0,0,-7))
r=w0.workplane(offset=-47/2).moveTo(-37,-17.5).box(22,21,47).union(w0.sketch().segment((-5,-47),(44,-50)).segment((48,28)).segment((-1,30)).close().assemble().finalize().extrude(-46)).union(w1.workplane(offset=44/2).moveTo(-36.5,24.5).box(3,51,44))