import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,8))
r=w0.sketch().push([(-28.5,41.5)]).rect(43,1).rect(1,1,mode='s').finalize().extrude(-56).union(w0.workplane(offset=40/2).moveTo(24,-16).cylinder(40,26))