import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-12))
w1=cq.Workplane('ZX',origin=(0,19,0))
r=w0.workplane(offset=-38/2).moveTo(-27,8.5).box(22,9,38).union(w1.sketch().segment((6,-35),(50,-35)).segment((50,6)).segment((40,6)).arc((25,38),(11,6)).segment((6,6)).close().assemble().finalize().extrude(-38))