import cadquery as cq
w0=cq.Workplane('YZ',origin=(28,0,0))
r=w0.sketch().push([(-45,-9)]).rect(10,30).push([(7,1)]).circle(23).finalize().extrude(-56).union(w0.workplane(offset=-13/2).moveTo(28.5,-2.5).box(43,1,13))