import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,2,0))
r=w0.workplane(offset=-52/2).moveTo(-6.5,-14).box(7,58,52).union(w0.sketch().segment((-13,3),(13,20)).segment((-2,43)).segment((-13,36)).close().assemble().finalize().extrude(48))