import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,7))
r=w0.sketch().segment((-50,-38),(50,-38)).segment((50,38)).segment((-50,38)).segment((-50,-8)).segment((-19,1)).segment((-14,-17)).segment((-50,-26)).close().assemble().finalize().extrude(-15)