import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,6))
r=w0.sketch().segment((-6,35),(6,30)).segment((6,41)).segment((-6,41)).close().assemble().finalize().extrude(-56).union(w0.workplane(offset=44/2).moveTo(0,-9.5).box(46,63,44))