import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,10,0))
r=w0.sketch().segment((-28,-13),(-25,-16)).segment((-25,-50)).segment((2,-50)).segment((2,-18)).segment((38,21)).segment((19,38)).segment((-8,8)).segment((-25,8)).segment((-25,-10)).close().assemble().finalize().extrude(-20).union(w0.workplane(offset=-6/2).moveTo(-25,37).box(26,26,6))